what year and model of vehicle did the TH-400 come in from the factory ??

 

Practically everything with a motor bigger than a 350, from 65 to sometime in the 80s. Especially (but by no means exclusively) full-size cars, and trucks.

 

1964-1990 although they stopped putting them in cars in the early to mid 70's. Mostly found in pickup trucks and vans. Truck TH400's have a bolt on driveshaft yoke. You'll need a TH400 slip yoke from a car.

In 1991 GM changed the TH400 to the 4L80E. Many of the internal parts are the same except it has an overdrive and is computer controlled.

 

if i have a short tail th-350 in my car now will a th400 with a slip on yoke be a direct replacement?

 

NOOOOOOOOO!!!!!

 

Installing a TH400 requires a new crossmember and a shorter driveshaft. It's not a direct swap to anything.

 

Do you know what cars cam with the size drive shaft i am looking for to put the 400 in my trans am. Where would i go to find the cross member?

 

There are no cars with a driveshaft the correct length for a third gen with a TH400.

I think there's a conversion kit available for TH400 swaps. It will include everything need for the swap including a crossmember.

There might also be a FAQ on how to do the swap using and modifying a factory crossmember I think from a manual car.

You could also buy a Spohn torque arm and crossmember kit to do the swap.

 

WAGONS - Fullsize wagons have nice heavy duty Tranny's and Rear-ends, the only things that had the same where the old 60-70's muscle.

 

Look for one like this... see if the owner will part it out for you

 

There were many changes internally over the years. The best ones were 1970-71. All the internal parts are interchangable so you can mix and match the parts to get the best parts from all the years to build a very strong tranny.

Just make sure you get one with a chev bolt pattern. Most of the TH400's that were in cars have BOP bolt patterns.

 

Actually, all I had to do with my driveshaft was to put the 400 slip yoke on. The 400 was within 1/2 an inch the same length of the stock 200c so the driveshaft length was fine.