Th400???

I've got a TH400 out of a '83 chevy diesel, is this the same "desireable" trans as the car TH400's or what??? thanks-

 

Should be heavier duty than the standard car TH400 and not really necessary for just a street driver. Somebody needing a TH400 for a higher perfomance application could use it.

 

Should be the same except for the vacuum modulator circuit. Diesels dont have manifold vacuum. Might need a different valve body.

 

Should be the T-475. Truck version with an extra clutch pack and heavy duty internals. Like an old QQ code from the musclecar days.

It will need a new valve body tho. Try to find one out of a full size buick with a 455, as those have the largest internal p***ages of any GM 400 valve body and will give you full downshifts into 1st instead of 2nd.

*some* [not all] GM diesel's had vacuum pumps where the distributor goes on a gas burner, so there's a chance your ****** os a vac model... But maybe not. At any rate, the diesel setup is for low rpm opperation.

It has the potential to be the foundation for one helluva strong street ******.

 

Both the 82 6.2l and 84 6.2L trucks and all of our 6.5L trucks we had ran factory vacuum pumps, and honestly, I'm not aware of a 6.2/6.5 without one, so it should be a vacuum mod. trans. The torque convertor should be uber-low rpm diesel specific though.

 

Check the rear and see if it has that bolt in yoke, if it does you'll need a custom yoke or change the output shaft.

 

I have used an old style TH400 with a short tail shaft in our race car ,and never had a problem..(well, kick the tail shaft off it once when the mount broke..)
But the ****** has worked great !

1939fiat

 

looks like it does have yoke that bolts onto the tailshaft and it turns out that it is outta a gmc rather than chevy, does that matter? thanks

 

Arn't the heavy duty t/h400's mentioned ealier only found on one tons, plus they have a "P" on the case and larger pan bolts?

 

Like I said earlier you'll need a special yoke that is machined for the O ring on the output shaft, I got mine from Inland Empire for about a hundred bucks.