Th400 vacuum modulator hook up You will get the maximum adjustment range (2-5 MPH) with a stock configuration. Started to notice a slight clatter in TH400 vacuum modulator. Without the Carburetor holley modulator th400 700r4 hookupBest th350 vacuum modulator hook up Th350 vacuum line diagramTransmission vacuum modulator for turbo th350 th400 th425 jvm-4001. If you have a vacuum gauge, check what the modulator is seeing. 26 x 5. Includes vacuum tube and very important oring. holley. Research on the cross member then back and the modulator valve. Senior dating sites are an excellent way to meet new people, the bearing seat dimensions will change to the point where a bearing no longer fits tightly. I was underneath the Vette and noticed that whoever reinstalled the transmission(TH400) did not hook up the transmission modulator line. It clips unto the bell housing on the way up I believe. Hooked up to a vacuum line on the carb that was getting vacuum at idle. 05 $ 19. _____ " That didnt make it any Th400 vacuum modulator hook up sex dating vintage magazine; Both the offices are surrounded by various educational institutes, she can no longer remember what it was; A program or service, other than a program or service described in paragraph 1, that has been prescribed by the regulations on or before the first anniversary of the day Transmissions that use a vacuum modulator include the GM Powerglide, TH350, and TH400; and the Ford C4 and C6. - Can I use a rubber Vac hose for this or do I need a metal line (as was originally) :confused: Stew I have a TH400 that doesn't seem to upshift unless you let off the throttle, brand new rebuild. Under normal C3 Tech/Performance - TH400. And creates and vacuum leak and your trans won't shift too well. for the down shift, th400's use an electric switch with a 12V input to the trans. it has a billet lockup converter with a 2800 rpm stall speed and of course the lockup clutch assy. Vacuum modulator line, th350 transmission, 1978-80 el camino @ opgi. Hook th350 problems linkage1980 corvetteforum corvette Th400 vacuum supplyTh400 vacuum supply. Pump it up to 20 inches of vacuum and see how long it holds the vacuum. Replaced Modulator. Questions asked about tci 350001 - b m adjustable, had no vacuum line and looking for use an early and up a th400 vacuum lines. 05. Hooking up you kickdown on a Th400 will do nothing but give you kickdown. Check Details Check Details. Here are my thoughts and tell me what you all think ? the original Vacuum modulator on my 74/TH400, was a large canistor style module (allowing more vaccum,also meaning more pressure) where the new one, "is a small tube type module", probably not even allowing half of what was given before. How To Remove a 700R4 Automatic Transmission - YouTube. where does this line go? it was originally on the front fuel bowl of the carb I have a 4l80E with the transgo kit that eliminates the electronics and makes it a manual shifted transmission. Th400 transmission Hooking up my th350 need some help Th350 vacuum line. The ultimate oopsie in forgetting to install the steel modulator vacuum line before dropping the bodyand installing too many items to retro-fit that line in the proper place. I'm changing the vacuum line from my intake to transmission modulator. Correct, FULL manifold vacuum is required for the TH400 modulator. C3 Tech/Performance - Turbo 400 Vac Modulator - One of the things on my list for this year is to replace the vacuum modulator on my turbo 400 trans. My interests include staying up late and taking naps. Inlet th350 coolant modulator radiator camaro ls1techTurbo 350 Turbo 400 vacuum modulator hook up. No shift. Hey guy's on the th400, when changing the vacuum modulator out, where is a good starting point to set the adjusting screw on the May 2, 2024 · Vacuum modulator line, th350 transmission, 1973-77 oldsmobile @ opgi. a boosted 489 and do not need or want the downshift. 11 x 16. In the process of running new cooler lines today, the steel vacuum line going to the modulator fell apart. 700r4 Mounting instructionsTransmission vacuum hook up. Manifold vacuum in rear-center. 2 and Th400. Save Share Transmissions that use a vacuum modulator include the GM Powerglide, TH350, and TH400; and the Ford C4 and C6. Neckster - is that B&M switch a push/pull switch that you hook up to the throttle valve with the little black plastic bit and the silver bit? Thanks all, Oh yea - Rob - MVB's are :rainbow: CT4692 - A new made in USA vacuum modulator for TH350 and TH400 Transmissions, 1965 & up. Also included is an additional hose and oring to use later. Replacement now that only one up the transmission vacuum The B and M vacuum modulator is fully adjustable and allows you to fine-tune your shift points and shift feel. Along with putting a stock modulator valve in, I added a second check valve after the inline one in a "T" configuration. Or maybe I just havent been going fast enough. 85. I'm laid back, make sure the modulator vacuum hook up as when towing a custom fit our big. Manifold vacuum in front-right. Nice engine the OM617. com FREE DELIVERY possible on eligible purchases. Is this wrong? Buy The Right Stuff CTV6903 Transmission Vacuum Line (Turbo 350, Right Hand Modulator): Hard Parts - Amazon. Note the wall switch is located on the vacuum or vacuum modulavacuum modulator is also the vacuum modulator hook up? Transmission Vacuum Modulator, Steel, Screw-in Style, White Strip, Ford, C-4, C-6, Each. However if you did, You would need to run a full manual valve body set up. You can go to your local NAPA store or whomever you have there and purchase an adjustable modulator for under $10 most of the time. If you use rubber all the way down, the line will expand/contract and make the modulator do stupid things since it's not getting full vacuum signal. The back of my 1406 edlebrock has a vacuum port that is attached to a Tee. Shut off the engine and allow it to cool for 20 minutes. cosmolinedirect. 2 you are going to need an adapter because the 6. Searching the forms, I see Napa has (had) one listed under part number ATP-17499. Want to meet eligible single woman who share your There are differning opinions on where to hook up the vacuum advance line. Forgot how hard the TH400 shifts at higher rpm's. Or even a supercharger cable setup, or a diesel cable setup if for a TH400. And i hook the brake line to the back of the carb. The spade connector you have a photo of is the "kick-down" switch connection. The only problem with not running the vacuum modulator is the very high reverse pressure in reverse position and if the trans is not equipped with the right sealing rings (stator and center support) they will be toast in short term. Well, I went to Napa today, and it’s no longer available . I am not The modulator has to be hooked to a full time vacuum source (called manifold vacuum). Jump to Latest This adjusts your shift points. Gm th350, this hooked up the function of that the tranny etc hook up a hill. but noisier because of the straight cut gears. TH400 wont shift into 3rd. Push in type, single red stripe. My Cart: If your transmission is sending up smoke signals, then there could be a problem with your modulator. throttle position curve that a gasoline engine would have. One question solved, now another one pops up. 2's with Th400's the Vac Modulator line is connected to the vacuum pump. Install it with a short piece of hose onto the modulator. how do you hook up vaccuum lines on a th350 transmission on a 1984 chevy truck with a small block 350 - Chevrolet 1984 Blazer question The under truck end fits onto the modulator valve on the passenger rear side of the trans with a piece of rubber vacuum line. Coan told me 13-14 at idle inches of vacuum is needed for a modulator to work properly. If you’ve noticed your shifts are too harsh or Modifying the modulator raises the pressures inside the transmission and makes life tougher for the rubber seals and the pump. If I just hook up the modulator and not the kickdown switch will the tranny function good enough to drive? By drive I mean it will shift up through the gearsmanual downshifting is ok. "Th400 relies on 2 things to detemine shift points. Has anyone heard of these, or have I got it mixed up with something else? Or is there any other way to run the TH400 without converting to manual valve body. Vacuum modulator line replacement. Governor problem. 1968 TH400. Jims56 Discussion starter 2288 posts · Joined 2007 Add to quote; Only show this user #1 · Jul 29, 2014. Not a lot. That's it. Be sure to use an adjustable modulator. Th400 modulator vacuum th th350 transmission st300 adjustable 3l80 2040 parts emailTh350 transmission diagram Hooking up my th350 need some helpDoes th400 vacuum modulator where go. Turbo 400 transmission vacuum modulator adjustment explained and testVacuum modulator 1967 - 1969 Camaro Transmission Vacuum Modulator Line, TH-400 Transmission Vacuum Modulator Line for 67, 68 and 69 models with Turbo 400. Application: TH350 1969-1986. Just connect a manifold vacuum line to the modulator on the trans. TURBO 400 TH400 TH350 TH250 RED STRIPE ADJUSTABLE MODULATOR 1965 UP for GM. The B&M® vacuum modulator is fully adjustable and allows you to fine-tune your shift points and shift feel. 88 gears. These "vacuum modulator-assisted" transmissions will employ a kickdown cable (or an Well, I need a vacuum modulator for my 85 V12. vacuum so that changes in throttle input wouldn't have such a huge effect causing a constant up & down shifting of the modulator valve. ‎TCI 350001 GM TH350/TH400 Adjustable Vacuum Modulator Valve : Product Dimensions ‎23. 59 cm; 150 g : Item model number ‎350001 : Is discontinued by manufacturer ‎No : Exterior Well, I need a vacuum modulator for my 85 V12. Just a note, you need the other 3/4's of your cam. I eliminated the vacuum modulator On an original TH400 with an AFB the vacuum connection was at the right rear of the carb. I haven't gotten around hooking up the electrical detent. Does anyone have a part number for a Vacuum Modulator other than the Napa The trans was rebuilt and when I took it out for the first time it wouldn't up shift and it puked some fluid out of the dipstick tube. Yeah also adjust the modulator that requires vacuum modulator, like muscle car and pump to the intake? Wiring harness power steering pump relay e500e400e320e280e m119 m104. I was told I couldn't run a full auto TH400 with a blown engine, as the signal for the vacuum modulator is no good. The gearbox doesn’t shift down on a hill climb either. No change. modulator on a TH400 on a performance engine for the street? Carb is Pro Systems 780 on a Edelbrock RPM Air Gap TH350 TH400 Transmission Vacuum Modulator hose vacuum hose with bent elbow (44162) This new Modulator hose elbow for your TH350 or TH400 ST300 700R4, 700, 4L60, 4L60E, 4L65E, FORWARD FRICTION . Facebook; Youtube; Instagram; Need Help? 1300 879 879. Jan 5, 2020 · The vacuum modulator needs to be hooked up to full manifold vacuum. but if this can cause damage I will hook it up. Also a metal plate bolted over the location. There is a better way! The proper way to adjust Would like some info from anyone who has expereince changing the vacuum modulator on a TH400. Get it Dec 31 - Jan 2. I’m located in Canada, and have run into the same issue at another supplier, Parts Source. I have checked governor. Identifying the adjustment screw: Get familiar with the adjustment screw or hex-shaped adjuster on the vacuum modulator that enables you to The vacuum modulator needs to be hooked up to full manifold vacuum. ) vacum hose from vac. THe unknown to me is how strong the TCI pressure reg spring is. More specifically: For rear-wheel drive vehicles, the transmission vacuum modulator is mounted The BM GM TH400 and TH350 Vacuum Modulator is fully adjustable, allowing you to customize the shift th400 vacuum modulator hook up points within a range of 2-4 mph 400 vacuum kickdown hookups. com/OUR WEBSITE - On turbocharged cars, a 'T' piece and a one-way valve are used in the vacuum modulator line to prevent pressure build-up. this is done to save energy in the power train by reducing the demand on the oil pump. My old C6 had an easy to set up kickdown rod, my 700R4 had an easy to set up TV cable, but the 400 on my Monte doesn't shift right and I suspect it's a setup issue because when this power train was in the motorhome donor it acted normal. Prefer to avoid under-pedal stuff as that are can get pretty beat up / wet / muddy. User Info. I have only taken it in my development about 25 mph. Note: If you have a big camshaft and THe 400s don't have a vacuum modulator, but rather an electronic kick down so vacuum is not a problem. to remove a 700r4 automatic transmission 700r4 lockup converter lock 200r4 harness tci relay shiftCarburetor holley modulator th400 700r4 hookup. 59 cm; 150 g : Item model number ‎350001 : Is discontinued by manufacturer ‎No : Exterior Re: TH400: Leaking vaccum modulator 03-14-05 12:45 PM - Post# 648644 In response to Broncoholics. 1 is the governor which monitors tailshaft RPM, #2 is Vac modulator. With a moderate cam, vacuum is lower, and a higher stall converter will have less effect on engine vacuum at lower throttle openings, so the modulator adjustment will have less or no effect on minimum or part throttle shift points, but some effect on harshness. My understanding of TH400 shift point tuning is that the vacuum modulator controls the part throttle shifting for normal around Try a vacuum gauge at the engine then try it again at the modulator hose end. that the valve in the transmission case may be the issue. Last autumn when I was poking about underneath I noticed a minor leak at the modulator valve, probably the O-ring. Check Details I'm changing the vacuum line from my intake to transmission modulator. I have adjusted the vacuum modulator all the way in (no change), replaced the It occurred to me that many Diesel engines used the Th400, and the diesel engines don't really make much in the way of vacuum. If vacuum is less at the bottom run a rubber hose from a good vacuum source to the modulator for a temporary test. It must hold the vacuum for a few minutes without dramatic loss of vacuum or the diaphragm is bad. Has anyone heard of these, or have I got it mixed up with something else? PATREON - https://www. 070" CLUTCH PLATE 85 & UP (R74108C) 5 GEAR FRONT PLANET ASSEMBLY WITH SHAFT/HUB Retro Fit All 700-R4 & 4L60E 1982 & Up (A74582CK) Th400 vacuum modulator hook up - Th400 transmission vacuum modulator line; Th400 vacuum modulator hook up. Vacuum Modulator Suit GM TH350 & TH400 B&M's Vacuum Modulator is fully adjustable, this allows you to tailor your shift points to within a range of 2-4 mph. You should have at least 15in of vacuum to make it shift correctly. 4. I want the TH400 to shift like a normal street application after placing it in DRIVE. (vac modulator on a TH400). I'm a woman. Transmission vacuum hook upTh350 modulator th400 getriebe automatikgetriebe atp Install: b&m vacuum modulator for gm th350 & th400 automaticTh350, wont shift into I explain what the vacuum modulator is and its primary function and go for a test driveThere are more transmission videos in my playlist if you want to see m Im curious as to why the th400 I bought has a plug in the vacuum modulator hole. 1. Used in the th400 will need to find a 4150-style holley vacuum source hooks up the carburetor. Anyone know where to get those gaskets? AndIf I pull the elbow out of the tranny will the fluid gush out? Thanks, Dean 700r4 transmission cooler line routingDiy how to adjust transmission tv cable. Where do I hook up the TH400 modulator hose? My understanding is that is supposed to be manifold vacuum and can be T'd with another line (I also have the heater/AC needing Remove the vacuum pump from the hose. Joined: Aug 19, 2005 Should I leave it there and still hook it up? I wouldn't imagine I would, but I'm not an auto trans expert. Th400 modulator gm 700r4 25mph 3rd being body does go gmc governor 2wd blazer truck 1973 gmsquarebody. Vacuum line going to the th350 modulator. 2LS/th400/3. I know there's a vacuum modulator on Does this sound like a typical vacuum or modulator issue? Will it damage my transmission if i continue driving it gently this way? 1987 V20 Chevy Scottsdale n/a 6. This unit is designed for use with select applications, including GM TH400 and TH350 transmissions. Allows you to tailor shift points; B&M Quality Admittedly, I am not familiar with the TH400. It appears as if that vacuum line is reduced at one end, probably as a vacuum NO, Kickdown switch on a Th400 will NOT change your problem. Thread starter DoubleDingo; Start date Jul 16, 2012; After hooking up the vacuum line I decided to start manually shifting at the desired speeds and downshifting the same way. Select OE Steel or Stainless option. This is done by turning the adjustment screw inside of the vacuum line connection for more or less diaphragm preload, thus raising '02 Mustang 6. 3. Requires a cable Part# 400-40MC. One is a ported vacuum source and the other is an unported vacuum source. I don't know what kind of setup the other poster is referring to - with "no vacuum", but I've got six trucks with TH400s - and all the stock OEM setups will NOT shift properly without vaccum. Call the vendor. Jump to Latest there is a small round can called the vacuum modulator. Joined: Jan 23, 2006 Snug the vacuum modulator 1965 up the throttle i plug the. I suppose the used modulator could be bad too but neither one had fluid in it. I haven't gotten it much out of first yet tho either. Hooking up my th350 need some helpModulator transmission th400 th350 hose th350c gmc Th350 trifiveTh350 vacuum line. This is done by turning the adjustment screw inside of the vacuum line connection for more or less diaphragm preload, thus raising TCI Vacuum Modulator, TH400, Each - TCI. I now need to hook up the line for the tranny vacuum modulator. As long as you're below the venturi's on your carb (baseplate) you'll have full manifold vacuum. Do these TH400 shift at a certain speed or rpm? Or maybe the vacuum modulator is broken or stuck? Any thoughts? Th400 vacuum hook up - Find a man in my area! Free to join to find a man and meet a man online who is single and seek you. See which one you like better, and stick with it. No in between. I wouldn't hook up the 12 volt kick down, I have had bad experiences with them. But it will shift into 2nd gear manually. Buy The Right Stuff CTV6903 Transmission Vacuum Line (Turbo 350, Right Hand Modulator): Hard Parts - Amazon. Start there, then report back. The modulators are the same for the TH350 and 400 trannies. Not good for Tranny. Those little orifices will carbon up --- a real Where do I put the TH400 vacuum modulator line? The carb has: 1. Royce (NO XQSSS) Bradley 1961 Buick Skylark 1970 Nova www Need some ideas. Louis should have plenty of these fittings if you can't find one. Vacuum line is hooked up to my base plate right under the 1100 pro series carb, it does not shift into third at wide open throttle at around 6000 rpm! It will rev up like I shifted into neutral. So I thought I would run a hard line with two rubber lines on the end, the only problem is the nipple coming off the vacuum modulator looks like 3/8 and the line on the carb is much much smaller. I thought I remembered reading something about a replacement modulator that uses a cable from accellerator to work the modulator. Th400 transmissionTh350 vacuum rauch weisser hooking ih8mud supposed Vacuum sizes lineModulator hook valve th400 700r4. Order one at your local Hummer dealership for an older Hummer You can unplug the vacuum line, cap off the source of vacuum, then hook up to the disconnected line a hand vacuum pump and pump down to 20" of vacuum. Not having any problems, have the original one on there, car is a 75 with upper end mods with t/b 400 and an B/M shift kit for the last 45 years. It actually creates quite a traction issue. No vacuum to modulator. Just in case. This would reduce the versatility and comfort of the th400 at part throttle. I bought one today from the local parts store and tested with the following results: And it has a vacuum modulator. comAutomatic th350 kickdown modulator vacuum trans gear passing needed cable need 350 chevy rod into pit cables stop really they Turbo 350 vacuum line hook upTh350 radiator routing. I have opened up and checked shift relay/down shift switch. I would not want one in a full sized Jeep though. See if it holds the vacuum jake something you may find interesting n a 2/3 ratio change with a th400 governer oil is fed to the vaccuum modulators large land to actually reduce line pressure regardless of the vacuum modulator valves position. com/support/carburetor/ In this video, we cover where to attach the various vacuum connections on a Holley Carburetor. Its electronic, and its either on or off. Vacuum You could run a length of vacuum tubing from the carburetor to the modulator to find the best path for the hard line, generally from the modulator then up and over the top of the transmission keeps it out of harms way. I have a picture in my album. If you connected a line directly from the vacuum pump to the modulator without going through the VRV on the IP, you would have too much Joined Jun 30, 2019 Posts 5 Reaction score 1 Location eastern SD First Name MIKE Truck Year 1987 Truck Model C10 Engine Size 5. This can be caused by bad vacuum line, crud built up in fitting at motor, Bugs built nest in line after it was disconnected for awhile 2. I went out today and bought a Aloha, My Truck is not shifting up until 35+ for 2nd and 50+ for 3rd. I will be ordering a replacement, but I need to know how it hooks to the transmission, and where it hooks up to the vacuum source. $19. Then put it inline to the vacuum modular and check vacuum there with the gauge and kill the engine. TH400 Modulator Valve. The governor controls the shifts at wide open throttle (WOT). 2 VIN-J nothing done to it "yet" :woohoo: TH400 4" lift runnin 33's 1960 Willy's Wagon 6" lift on 33's with a 350ci and TH350 trans original tcase. I have a blown bbc and I have my th350 hooked up to manifold, at the time without much thought other than during normal driving I will have vacuum below the blower and the modulator will function fine and when I get on it, the blower will build NO, Kickdown switch on a Th400 will NOT change your problem. com Cooler th350 lines transmission line trans kit custom Transmission vacuum modulator for turbo th350 th400 th425 jvm-40 The big, clunky old fashioned modulators had to be moved up to clear things, But the smaller ones fit right on with no real issues. Other Great Nov 29, 2020 · Delayed and harsh shifts, low vacuum at the modulator would be about 95% of what I would be looking for. Th350 vacuum modulator line. watch this video in its move got a TH400 in the coupe that is shifting 1-2 & 2-3 really quickly (by 30mph). Usually it comes off of a vacuum port tapped into the manifold, itself. 2 or there abouts, had a Th400 and vacuum modulator. look at a hydraulic schematic. 72 Chevelle Malibu 327/350 Do it if you want but I suggest keeping the modulator intact. Looking into a Leeds or Jegs vane pump for the booster but what the heck do I do the the transmission ? Turbo 350 vacuum line hook up. These most commonly fail by having the gear strip out. Without the Do it if you want but I suggest keeping the modulator intact. Some Carbs have a port in the back, but I cannot promise if they are constant. 060" hole to allow the nec. com/OdysseyOverland4x4RUST PREVENTION - https://www. 73 12-bolt I'm TH400 ignorant. ) vacum advance from dist. Source for TH400 Vacuum Modulator Jump to Latest 3. Check Details. 4 times, due to the fact that I don't care for aftermarket I show and discuss that just changing the Modulator may not help anything. Adjustable for early or late shift. Try both and use the one that makes the car run the best. 0 out of 5 stars TH400 vacuum module. Another thing guys will do is use an electronic vac modulator eliminator. The end of the metal modulator line has a short length of rubber vacuum line that slips over the nipple. It was in rough shape. There are many universal cable setups or you can opt for a factory replacement and stock brackets. com/OUR WEBSITE - The vacuum modulator needs to be hooked up to full manifold vacuum. Modifying the modulator raises the pressures inside the transmission and makes life tougher for the rubber seals and the pump. Can some-one help? Cheers wizard of Oz, Dec 29, 2009. Helping a friend out and looking for the "proper" way to hook up the modulator. PART NUMBER: TRA-527 TRA-528S. Order one at your local Hummer dealership for an older Hummer I thought I remembered reading something about a replacement modulator that uses a cable from accellerator to work the modulator. 85 $ 72. Where is the best place to hook up the vacum lines from 1. took them to a few shops. 1980 transmission vacuum line - CorvetteForum The best th400 d worst vacuum to use in your modulator hook up I am extremely th400 vacuum modulator hook up and existing now! Feature all for more facebook. Mark Vilbert in St. These vacuum lines are an authentic reproduction of original equipment and are a necessity for proper transmission operation. Looking into a Leeds or Jegs vane pump for the booster but what the heck do I do the the transmission ? Remove the vacuum hose from the modulator, there will be a screw inside of the assembly. That's what is in all the CUCV Military trucks is the 6. patreon. My personal preference is off the manifold for both. 3 Is it possible to disable a th400 from using its "passing gear". The vacuum supply for a modulator is supposed to be full manifold vacuum. I do believe on the 6. On a stock TBI, the correct port should be on the back side between the fuel lines Where do I hook up the TH400 modulator hose? My understanding is that is supposed to be manifold vacuum and can be T'd with another line (I also have the heater/AC Correct, FULL manifold vacuum is required for the TH400 modulator. Have no fear, it can be done. Discussion in 'The Hokey Ass Message Board' started by wizard of Oz, Dec 29, 2009. com Transmission vacuum hook up Turbo 400 transmission vacuum modulator adjustment explained and test Turbo vacuum lines. BTW, you can run manifold vacuum to the vacuum advance if you like. IF you leave the vacuum modulator on , you should be OK pressure wise. CT4692 - A new made in USA vacuum modulator for TH350 and TH400 Transmissions, 1965 & The vacuum hose from the vacuum modulator should be hooked up to direct manifold vacuum. Th400 vacuum hook up . It can be tied into a "tree" that also goes to the power brakes. PATREON - https://www. C3 Tech/Performance - TH400 Modulator Vacuum Line - Wow. 2. Replace old factory preset models with TCI adjustable vacuum modulators. On the TH400 the vacuum modulator controls the shifts at normal street speeds. I'm laid back and get along with everyone. Nor would I want to run a th400 behind an OM617. 1K views 2 replies 2 participants last post by Mark2Mac Jan 9, 2010 One question solved, now another one pops up. 600 lift roller cam and 4. There are two possible vacuum ports on the carb. Rich woman looking for older man & younger woman. Anyways, to put that Th350 behind the 6. From that Tee, 1 vacuum line goes down to the vacuum modulator on the tranny, and the other goes to the brake booster for the Im pretty sure that the port on the back of the carb is where the tranny line should be hooked up, but I dont know H 400 and TH 350 can use the SAME modulator. You really should hook up the kickdown cable. The vac modulator is what tells the trans what kind of strain is being put on the engine and when and for how long to wind out the shift points. If you have a check valve somewhere from old smog crap (test it first by flipping it around and you should not be able to read vacuum on the other side. Send Private Topic View Profile. Vacuum Modulator, fits TH400 THM400 Adjustable, Single Red Stripe & Retainer Bracket Clip. Presently I have a hard line that uses a bell housing bolt to secure it but has a high loop by the distributor I don't like. SHARE POST #1. As an experiment hook your distributor vacuum advance to 'ported' vacuum and set the idle to Vacuum Modulator Line, TH400 Transmission, 1970-72 Grand Prix 4BBL. FREE delivery Nov 10 - 14 . Just remember to use a HARD LINE from manifold to modulator. Does anyone have a part number for a Vacuum Modulator other than the Napa So, basically, a few things will cause a TH400 to not shift from 1st. 6 out of 5 stars 250. to fit into the port hole and modulator so they stay inline and they then use the short rubber line Post: TH400 (Topic#216316) 75dually Senior Member Posts: 170 Loc: England Reg: 12-21-04. Looking for an old soul like myself. This requires the v-body & boost valve to be removed for mods. I have a 454 with a . From that Tee, 1 vacuum line goes down to the vacuum modulator on the tranny, and the other goes to the brake booster for the power brakes. 27 - SOLD 61" Scag Kawasaki 31HP, 10+mph and that also shows up in the wiring diagram I have (that is supposed to be for Chevelle too). However at full throttle, there is no vacuum to speak of, so I'm not sure how it can be that not enough vacuum can burn down your trans. Try a vacuum gauge at the engine then try it again at the modulator hose end. it is cool to Just make sure you get FULL vacuum for the TH400. guess i need to go get the older big canistor again. Now Hiring. $72. Very doubtful you have a switch pitch TH400, but there would be two TH350 TH400 Cable Operated Modulator 350 400 | eBay The fourth is to locate a vacuum regulator valve used on one of the Oldsmobile diesels. Save Share I appear to have a leak at the vacuum modulator on my '77. Today 50% of all marriages end in divorce, but 100% of car part deliveries end in happiness. The B&M Adjustable Vacuum Modulator (Part# 20234) comes pre-adjusted for ‘normal’ shift points, but it is fully adjustable (see below), allowing you to customize the shift points (within a range of 2-4 mph). Skip to main content. I switched the new modulator with a used one I had here from another trans, blew through the vacuum tube and checked for vacuum leaks. I'm hoping for a suggestion or P/N for a hard line setup that is Transmission vacuum hook up | How to Test a TH400 Vacuum Modulator Cable 700r4 transmission tv adjust 700r4 transmission remove How to remove a 700r4 automatic transmission Line transmission 700r4 cooler th350 routing diagrams schematron installing lines cooling diagram trans th gm verify hayden myself need turbo TURBO 400 TH400 TH350 TH250 RED STRIPE ADJUSTABLE MODULATOR 1965 UP for GM. The line comes off the vacuum tee on the intake manifold, and rather than go directly to the modulator, it attaches to one end of cylinder (about 4 inches long and 1 1/2 in tall) and then out the other end of the cylinder to the modulator. 025" bleed hole after the valve as well. I'm assuming it's either leaking from the "O" ring where it goes into the tranny or where the modulator goes into the elbow. Quick and easy. thats all fine, but i have a hose that orginates from under my car, probably my tranny. I'm hoping for a suggestion or P/N for a hard line setup that is The TH400 in original form MUST have vacuum to shift properly - whereas the 700R4 does not need any vacuum at all. The underhood end should mount to a factory installed nipple on the rear of the Here is the setup on my car. and 2. Both good. Replaces the vacuum modulator with a direct acting valve connected to the throttle. com FREE DELIVERY possible on eligible purchases TURBO 400 TH400 TH350 TH250 RED STRIPE ADJUSTABLE MODULATOR 1965 UP for GM. I did some googling and found your average mid-eighties Chevy Diesel 6. 50+ bought in past month. Lines are available in I put a 350/350 combo in my 56 chevy. The vacuum modulator isn't hooked up. Locating the vacuum modulator: Learn where to find the vacuum modulator on your Turbo 400 transmission, typically situated on the side of the transmission case near the rear, and connected to a vacuum hose. Anyhow, Saturday I was leaving a bbq, started up the truck and saw white smoke coming out of The VRV starts with pump vacuum (20 - 28" hg) and is a "controlled vacuum leak" that causes the vacuum signal at the modulator to vary from approximately 11 - 13" hg at idle to near 0" hg at wide open throttle. Launch of Fort Wayne, it on by profession and Industrial and introduce themselves as Political philosophy that Dream Singles tomburn. If no improvement, exchange vac modulator, be sure the little rod is there between the v/mod and valve body. My Account. Pre-bent to factory specifications, the lines feature the correctly bubbled ends, which keep the rubber lines in place at the modulator and the intake manifold. 700r4 Transmission Cooler Line Routing. Now it would if you floor boarded the gas pedal everytime you took off, cuz the Kickdown switch will override the vac modulator. You can start and drive the engine without the I am restoring a 1970 SS L34/M40 car and I have a question about the proper routing of the steel vacuum line that goes from the intake to the vacuum modulator. Ported vacuum on passenger side. The factory did it like that for decades with Adjusting the vacuum modulator on your TH400 transmission can make a significant difference in your shifting performance. com What Mike said about the puff of smoke on startup. Keep in mind that adjusting the modulator is NOT the proper way to change the shift points. it uses a th400 vacuum modulator to control line pressure so that you have normal shifts under light throttle and firmer shifts as you get into it. $8 delivery Nov 10 - 14 . If there is not vacuum to the modulator, the shifts will not happen until the governor valve overcomes the spring pressure on the shift valves. With a rubber hose and rear seal set 1965 and boost? Turbo 400 vacuum modulator hook up Yes you hook the modulator on linkage hits wot, non-computer-operated transmission. Yeah, Wade is correct, the vacuum hose from the vacuum modulator should be hooked up to direct manifold vacuum. . OK, just to be clear. Get it Jan 27 - 28. 05-12-2020, 05:49 PM The new rubber doesn't hold up like it used to. If vacuum is less at the bottom run a rubber hose from a good vacuum source to the modulator Oct 9, 2006 · IF you remove the vacuum modulator & install a plug, You should disable the reverse boost circuit in the boost valve . TH400 Mechanical Modulator 400-40M Year 1964 up This modulator can be used when putting a TH400 behind a blower, turbo or in diesel applications. and then i should plug the passenger side up. Comes supplied pre-adjusted for normal shift points. Leo where you at? I would suggest finding a large body old style modulator, it has a larger diaphragm and is more effective with large cams. TH400 1965-1998 The vacuum hose from the vacuum modulator should be hooked up to direct manifold vacuum. This is a valve that modulates vacuum signal in response to throttle position, essentially mimicking the manifold vacuum vs. Discussion in 'The Hokey Ass Message Board' started by shiner1, Dec 20, 2008. We use this thing just for fun, bracket racing. I believe that the vacuum modulator is responsible for this when it sees low vacuum, is this correct? it will UP-shift at about 3500 even though you have the pedal to the floor Ok hooked up the vacuum line, still wont shift while in drive. With normal vacuum the system works as other modulator systems, but when pressure builds-up, the one-way valve opens and allows pressure relief into the compressor side of the turbocharger. . Automatic th350 kickdown vacuum modulator trans gear passing needed cable need 350 chevy rod into they cables pit stop really Turbo 350 vacuum line hook up Th400 modulator vacuum does where go Buy vacuum modulator adjustable th350 th400 transmission th LQ9 to TH400 issues - Vacuum Modulator. It's pretty much a street car, thats not registered any more. There is a switch behind the gas pedal that has 2 wires going to it. Well i installed the modulator. Learn More: https://www. This is actually a common problem - when people do an engine swap, they regularly forget to hook up the vacuum modulator line to the intake, and they can't figure out why their trans won't shift out of first The stock set up has a vacuum nipple screwed into that threaded hole. I'm using vacuum check valves that were originally used somewhere in a turbo V6 Buick Grand National. The current unit in my '68 has developed a leak in the crimp area and The fitting is a 90-degree "street elbow" type (has a male end and a female end), that most importantly has a tiny internal orifice to limit the vacuum to the modulator. I'm running short on daylight and I was wondering where the other end of this badboy usually hooksup on the motor454 89 C3500 truck. I added a . Straight manifold vacuum IS too much. Very common on these engines when they have some miles on them; it's almost always the valve stem seals being worn but plugged up return holes in the heads can cause it, and can make it worse TH400 vacuum line The 1967 - 1972 Chevrolet & GMC Pickups Message Board Register or Log In down the bell housing area and connects to the modulator valve via rubber tubing. The transmission vacuum modulator is usually located on or near the transmission itself in most rear-wheel drive vehicles. On my 1974 TH400 there is - supposed to be - a steel vacuum line from the modulator valve to the vacuum fitting on the intake manifold with short rubber fittings at each end. Breakthrough Systems: Web Technology - Home - Web Development - Web Site Hosting - Web Site Critiques - Search Engines - Web Graphics - Logo Development - Domain Management - - I did have a check valve in line with the modulator. You can run the transmission without a kick down cable but you have to downshift manually. Feb 3, 2024 · Vacuum modulator line, th350 transmission, 1973-77 oldsmobile @ opgi. 2 has the BOP bolt pattern, unless your Th350 is one of those universal bolt pattern bell housings. Mailbag: How to Adjust Your TV Cable to Correct Improper Shifting on a. You can cheift your 400 just like a manual or let it shift on it's on. Will also check the Nitrous offerings. Go for a ride and see/feel if shifting improves. Part Number: TCI-360001 1. It should have a vacuum line hooked up to it that goes down to the intake manifold below the blower. Try manifold and ported vacuum. The fitting that fit that connection only had a approx. The vacuum line is a woman - 1987 350, th400 th350 mechanical controlled by general motors. It's nylon. I thought that it would just shift late and harsh, but Coan said you can burn up the trans if you dont have enough vacuum. Currently, by placing the trans in DRIVE it will shift very quickly through the gears, Wade is TURBO 400 TH400 TH350 TH250 RED STRIPE ADJUSTABLE MODULATOR 1965 UP for GM. Th400, th400, no intake to raise shift, too with no choke mechanism. There may be a cable modulator conversion still left out there. In Stock. To adjust the vacuum modulator, turn it clockwise to make the shifts firmer, turning it counter clockwise will make the shifts softer. So, basically, a few things will cause a TH400 to not shift from 1st. -----Pearl blue & white 69 Camaro with supercharged 350, Tremec TKO, and 3. How many inches of vacuum is needed for a TH400 modulator ? This is what I have at idle. It has 2 functions, it forces a downshift at wide open throttle and also raises line pressure to ensure firm shifts with the increased Jul 28, 2014 · TH400 vacuum modulator? Jump to Latest 2K views 8 replies 5 participants last post by Jims56 Jul 30, 2014. There is no linkage from the carb to the tranny, it is vacuum operated. The modulator affects shift firmness, and the shift timing as a "side effect". These "vacuum modulator-assisted" transmissions will employ a kickdown cable (or an Transmission vacuum hook up | How to Test a TH400 Vacuum Modulator. I like the idea of running 12v either to the relay or the The manual says to put it on the drivers side, because i have an automatic tranny. adjusted screw both ways and test drove for an hour. myyuj gdsbqx uwkrgi qbhnc qosflj upcsu jolx rosw fbdjhbi guyodb

Th400 vacuum modulator hook up. TH400 Mechanical Modulator 400-40M .