This was one of General Motors editions of the Hydramatic transmission series. This transmission is known more commonly by the name TH , although it did receive another name change in the late 80s , adopting the name 3L This is a durable and very well-known transmission, as it was in production for many years and applied to a wide variety of vehicles, not only General Motors. This transmission eventually made its way into many of the truck applications for General Motors. The transmission was not exclusive to General Motors, as many luxury brands such as Jaguar , Ferrari , Rolls-Royce and many others made use of this transmission. The TH was first introduced beginning in , as it began to replace the Super Turbine transmission, which was a 2 speed automatic. The Turbo was placed in many cars across GM as well as other car manufacturers during its long production life.

Technical Details

Does it matter if I hook it up at all? Most of the other transmissions used a mechanical linkage or cable to indicate wide-open-throttle WOT. This WOT trigger achieves two things: Above a certain speed, as determined by the governor, the transmission will not downshift from third to second or second to first gear. This is to protect the transmission from damage.

Dec 29,  · Best Answer: Connecting the gauge to the vacuum line doesn’t measure te output of the turbocharger- it just measures the amount of engine vacuum. The gauge you have will work for measuring boost, though I would rather use a 0 to 30 PSI gauge. To hook up the gauge so it reads turbo boost is rather : Resolved.

Need vacccuumdiagram for 77chev engine loosing transmission fluid to i dont know where not leaking on ground Hello shanebuerman: My name is Roger and I will help you. If you are using transmission oil and see no leaks on the ground I would look at the transmission as the source of the problem. If you have a turbo-hydromatic transmission look at the modulator valve. It will be on the passenger side of the transmission and have a vacuum line attached to it.

This will be a metal line that runs over the top of the bell housing. The other end will be connected to the intake manifold at the rear of the carburator.

GM TH400 Automatic Transmission

I am attributing that to my errors with the tape measure in my haste to get mine measured so I could get back into a warm house, and I am simply using the published specs. First up, let’s tackle overall length and case length. Overall length is important for the final driveshaft length and the case length is important for the fitment to the transmission tunnel.

This will require shortening the driveshaft by a matching amount, so I know that no matter what I will be paying a visit to the local driveshaft shop, which I would be doing anyway – see the section on Inputs and Output for details on why.

When you get ready to run the vacuum line from the turbo transmodulator to an Edlebrock Performer CFM carb, attach the vacuumline for the.

This action typically creates a mechanical symphony as the secondary barrels open, the transmission downshifts, and the speedometer and tachometer sweep clockwise. But if a Turbo was transplanted into an older Pontiac without installing some type of kickdown switch, a large part of the fun could be missing. The most common three-speed automatic transmissions used in performance applications today are the Turbo and Turbo Both are strong, reliable units that are internally calibrated to up-shift in a predetermined range based on a combination of engine load and speed.

And they are also designed to downshift when conditions require additional engine speed to maintain vehicle speed or more commonly, when we stab the throttle to accelerate briskly. As similarly as the two transmissions function, there is a significant difference in the way downshifts occur. The Turbo kickdown function is mechanically operated via a cable mounted on the intake manifold near the carburetor.

When the throttle linkage reaches a specific point, the cable triggers a mechanical detent valve inside the transmission—allowing it to shift into a lower gear. The Turbo uses an electric switch to trigger a detent solenoid on the valve body to produce the same effect. It seems that either system works equally as well and neither is typically failure prone.

Th400 Vacuum Hookup

This action typically creates a mechanical symphony as the secondary barrels open, the transmission downshifts, and the speedometer and tachometer sweep clockwise. But if a Turbo was transplanted into an older Pontiac without installing some type of kickdown switch, a large part of the fun could be missing. The most common three-speed automatic transmissions used in performance applications today are the Turbo and Turbo Both are strong, reliable units that are internally calibrated to up-shift in a predetermined range based on a combination of engine load and speed.

Oct 02,  · Does the vacuum modulator on a Turbo Hydramatic transmission control downshift points as well as upshift points? I know it changes upshift points based on engine load, but will it also downshift the transmission based on engine load?

Where is the automatic transmission modulator located on a Cutlass Supreme? MORE If you are changing your for a on your K with an automatic transmission will the wiring hook up and do you have to replace the computer chip? Yes,wires will hook up the same and no you dont have to change the chip. If you change your to a in your K with an automatic transmission will the wiring hook up exactly and will you have to change the computer chip?

Yes your wires will hook up and no you wont have to change the chip either. This is from a Chilton’s manual: The vacuum control modulator is accessible from under the vehicle on the driver’s side. Disconnect the Negative battery cable. Raise the v…ehicle and support it safely on jackstands. From underneath the vehicle, remove the vacuum hose attached to the vacuum assembly.

Ask Away: How Do You Hook up a Turbo 400 Kickdown? (Hint: It’s Not Like Other 3-Speeds)

This switch has a wire going down to the transmission to a detent solenoid inside the transmission that caused the transmission to drop down a gear below 70 mph. We took off the QJet carb almost immediately after we bought the car, replacing it with a Holley carb. You can skip down to wiring part of this article. There you have several choices. The instructions say you should reuse the TH kickdown cable bracket. We found a TH kickdown bracket for a small block Chevy that was lying in our spare parts bin.

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Modify Holley or Carburetors for a Blower Application. This is commonly referred to as a “Boost Referenced Power Valve”. On a Model you would be looking at doing both the Primary and the Secondary side. On a model just the Primary side has a Power Valve so that would be the only side done. On the ends of the main body where the Metering Blocks bolt up there needs to be a slot cut to redirect the route for the Power Valve to receive a Vacuum Signal.

The Slot “C” picture 1 that needs to be cut is outlined in Red and needs to be. The idea here is to have just enough angle so that the hole stays under the surface to provide a path for the new vacuum source for the Power Valve. It is also possible to use a dremel or die grinder and cut off wheel but extreme caution should be used if that way is chosen. Also in picture 1 you can see the original vacuum passage that supplied the Power Valve “H” arrow.

GM TH400 Automatic Transmission

This information applies in large measure to the TH R4 transmissions, but not to any of the computer-controlled transmissions that came later – they are all controlled by the computer and the wiring is more or less just to all the sensors involved and is specific to the computer you have to use. Overview The only wiring work you need to do on these transmission is wire up the controls for the lockup feature on the torque converter.

This can be accomplished with simple kits from several places or with custom wiring of your choice. The kits typically have two wires going into the transmission – one is power to the torque converter clutch and another is a ground connection. When you have power and a ground, the converter is “locked”. When one or both are disconnected, the converter is unlocked.

mercedessource Tech help – When troubleshooting your vacuum system you must know where the hoses and lines go On many diesels the diagram was on a sticker mounted on the front core support of the engine as you see in this picture for a SD. But these stickers do come off and you are stuck with finding the right information online or in a manual.

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Bad governor gear on turbo 350/400 transmission