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Transmission diagram th400

No reverse. Everything works weell.

Posted by Anonymous on

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  • AMC Master
  • 1,108 Answers

You'll have to go to GM for this diagram, but sounds like it's just dirt plugged the movement of fluid to reverse clutch pack. Since Google is your friend, type in "fluid path diagram for a GM TH400 transmission" and see what comes up.

Posted on Nov 06, 2014

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Mechanic65
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SOURCE: reverse switch on th400 transmission

If you are llokin at a late 60's Early 70's Nova and transmission set up. There is no wireing on transmissions. Wireing for that vintage cars were on either on the steering column under dash for column shifters. on in floor console for floor shifters.

Posted on Oct 25, 2009

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1 Answer

Diagram of hoses going to transmission on 93 chevy k1500 4x4


There are no vaccum hoses unless it is a TH400. The standard 4x4 overdrive trans could have a hose to the vent on top of the trans.

Oct 27, 2016 | 1993 Chevrolet K1500

1 Answer

How do i replace transmission modulator valve on a 1991 gmc sierra 1500 4.3


UNLESS you have a TH400 3 speed HD automatic transmission, which I HIGHLY doubt being it's a 1500 with a 4.3, you won't have a vacuum modulator. UNLESS someone swapped an older TH350 or TH400 transmission into the truck.

Instead you'll have what called a TV cable, or throttled valve cable.

This cable should be located on the passenger side of the transmission and is routed up to the side of the throttle body and hooked up like the old "kick down" cables.

The TV cable isn't simply a "kick down" cable, even though it does act like one, it also adjusts the pressure for the transmission to shift at different throttle positions. Much like the old vacuum modulators did.

Hope this helps.

Feb 10, 2015 | GMC Cars & Trucks

1 Answer

How do I adapt a Mitsubishi 3.0 v6 to a th400 transmission?


You will have to have an adapter plate made, you will need an adapter for the bell housing to the block and the same thickness plate to adapt the flywheel to the torque converter.

Oct 17, 2014 | Cars & Trucks

1 Answer

How to replace filter (diagram maybe?) in 400 turbo automatic transmission thats sitting in a 1985 fleetwood southwind motorhome?


  1. Check the fluid level. The first thing to check if you suspect that the transmission is acting up is the automatic transmission fluid (ATF) level in the transmission itself. The dipstick on the TH400 can be found inside the engine bay, on the passenger side toward the firewall (opposite the radiator). Pull the handle attached to the dipstick, which will remove it from the dipstick tube. Clean any fluid off and put it back into place, making sure that it seats all the way. Then remove it again and look at the tip of the stick. There are level indicators there, which will tell you if the transmission is low on ATF.

  2. 2

    Check the linkages. The linkages that are connected to the shift lever can get out of alignment at times, causing sloppy or difficult shifter response. Look for abnormalities such as bent or broken parts, loose attachment points, or blockages that would prevent smooth shifting.

  3. 3

    Change the filter. Unbolt all 13 transmission pan bolts (on the bottom of the TH400) and remove the pan. The filter is found in this area of the transmission. Filter kits, which include the filter and a new pan gasket, can be found at any auto parts store. Replace the filter and fill the transmission with new ATF (the TH400 requires six quarts). Do not put the bolts back on too tightly, as the gasket can become damaged. Six to 8 foot-pounds should be plenty. If no torque-wrench is available, just put them on as tight as you can by hand, and then turn them 1/2 revolution.

  4. 4

    Inspect the cooler lines. The number-one killer of automatic transmissions is heat. If the cooler lines that come from the radiator are damaged or leaking, it might be necessary to replace them. These items can also be found at the local parts store.

Apr 05, 2013 | Cars & Trucks

3 Answers

I was wondering if a 1986 400 transmossion would fit a 1987 chevy silverado r10?


is it a electronic transmission, or manual! this makes the difference! call a ****** shop to get more info on this. good-day!

Oct 04, 2011 | 1987 Chevrolet R10

1 Answer

I am looking for a thm400 ****** for 70 pontiac would a 1985 gmc sierra ****** work? i have a gm adapter plate , also underneath on right side of trannyon gmc there is no vacuum line does it build up...


The 1985 GMC Sierra transmission is a th700R4 overdrive transmission. The 700R4 does not utilize a vacuum modulator. Shift points are controlled by the T.P. or kickdown cabe. Proper adjustment of this cable is critical to transmission longevity. Your Pontiac, if originally equipped with a th400 transmission, has no means to connect this cable to the carburetor. I would not recommend this transmission swap. Also the th400 and the 700R4 use different sized drive shaft yokes, so your drive shaft cannot be used.

Aug 20, 2011 | GMC Sierra 2500HD Cars & Trucks

1 Answer

What year/model transmissions will fit a 1989 GMC sierra, 2500, 350 engine, 2-wheel drive? Thanks


A.T., VIN model "C" (4x2), TH400, 6 cyl
A.T., VIN model "C" (4x2), TH400, 8 cyl, 8-305 (5.0L)
}A}}400}466495" type="radio" name="userInterchange" />A.T., VIN model "C" (4x2), TH400, 8 cyl, 8-350 (5.7L)
}A}}400}466496" type="radio" name="userInterchange" />A.T., VIN model "C" (4x2), TH400, 8 cyl, 8-379 (6.2L, diesel)
E>}B}}400}466497" type="radio" name="userInterchange" />A.T., VIN model "C" (4x2), TH700, diesel
A.T., VIN model "K" (4x4), TH400, 6 cyl
B@}}}400}466499" type="radio" name="userInterchange" />A.T., VIN model "K" (4x4), TH400, 8 cyl, diesel
A.T., VIN model "K" (4x4), TH400, 8 cyl, gasoline
A.T., VIN model "K" (4x4), TH700, diesel
FFC}B}}400}466502" type="radio" name="userInterchange" />M.T., 4 spd, 4x2, VIN model "C"
FFC}A}}400}466503" type="radio" name="userInterchange" />M.T., 4 spd, 4x2, VIN model "R"
ECB}B}}400}466504" type="radio" name="userInterchange" />M.T., 4 spd, 4x4, (VIN model "K")
M.T., 5 spd, 4x2
M.T., 5 spd, 4x4
A.T., VIN model "C" (4x2), TH700, gasoline
F=A}B}}400}466508" type="radio" name="userInterchange" />A.T., VIN model "K" (4x4), TH700, gasoline
}B}}400}466509" type="radio" name="userInterchange" />A.T., VIN model "R" (4x2)

Jan 14, 2011 | 1989 GMC Sierra

1 Answer

Reverse switch on th400 transmission


If you are llokin at a late 60's Early 70's Nova and transmission set up. There is no wireing on transmissions. Wireing for that vintage cars were on either on the steering column under dash for column shifters. on in floor console for floor shifters.

Oct 25, 2009 | 2003 GMC Sierra 1500

1 Answer

When i put it in reverse or drive first thing in the morning or when its cold it takes a long time to engage the gear has new filter, and fluid.77 chevy th400


Hi I am Vortash from the symptons you describe I assume the vehicle is an automatic , if so it may be that although you have replaced the transmission oil .You may find the Torque converter is warn and in need of replacing or that the transmission fluid is not up to the correct level or there is an air lock in the converter chamber .. look for Torque converter opperation on google it may help you to solve this problem hope this helps regards Vortash

Jul 11, 2009 | Chevrolet 2500 Cars & Trucks

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