GM TH400 transmission?
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Senior User
Joined: Apr 2002
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GM TH400 transmission?
anyone know this tranny? It came from a Jeep J10 I believe, which was their pickup truck. I am looking at a hunting buggy that has this tranny, which apparently got water in it and is now shot. The engine is a 360AMC.
I know this is a ford site, but I figured I could get help here. Just wondering what a tranny rebuild typically costs. I'm not sure if i should expect $1000 or $2000. Plan to start looking around but thought you might help.
thx
I know this is a ford site, but I figured I could get help here. Just wondering what a tranny rebuild typically costs. I'm not sure if i should expect $1000 or $2000. Plan to start looking around but thought you might help.
thx
Super Moderator
Joined: Apr 2004
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Introduced in '64, some say the strongest 3 speed car/light truck automatic ever made. May still be in production, or recently out, not sure. (see the propaganda on the following site) $1100 here:
TCI Auto: TH400 Sizzler® Transmission 4" Tailshaft
Similar to the C6 Ford.
Due to the massive numbers produced, you should be able to find one for less. Not sure about the bell pattern and how that all works with the Jeep motor, but you'll figure that out with a phone call.
Consider having it rebuilt perhaps?
TCI Auto: TH400 Sizzler® Transmission 4" Tailshaft
Similar to the C6 Ford.
Due to the massive numbers produced, you should be able to find one for less. Not sure about the bell pattern and how that all works with the Jeep motor, but you'll figure that out with a phone call.
Consider having it rebuilt perhaps?
Hotshot
Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
$600-$800 would be a reasonable price for a rebuild, but don't expect to find a rebuilt one cheap- that AMC engine uses it's own bell pattern, so that makes them worth a fortune. I'd take your to a reputable shop, and have it rebuilt.
New User
Joined: Dec 2008
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Th400's were very good units. They ended their production run in the late 80's-early 90's when overdrive units took their place (4L80E). The only weak link (if you can even call it that) I ever knew of in them was the one way clutch, when towing serious loads on downhill grades and being downshifted, they sometimes shattered, but rarely. Over their life span there were 15 different tailshaft variations, and depending on the service duty they had stamped steel or cast aluminum servos. The biggest downer to them is that they love to eat horsepower, I believe its right around 23 HP that is consumed just to turn one of these beasts. A rebuild kit to DIY runs around $125-200, I've done several and they're easy (actually my favorite to rebuild), the trickiest part is getting familiar with placing C-clamps on the drums to compress the springs & release the servo retainers (unless you have the actual tool for this). New stock converters can be had around $60.
