looking to swap turbo 350 trans out for th 400 in my 1980 camaro anyone that has done it wondering about bolt up issues and driveshaft lenth thanks

 

You'll need to relocate your trans crossmember, change the yoke out on the driveline. Should bolt right up to the engine, same bolt pattern. Your 1980 should have the larger U joints, so you wont need the weird small by large U joints.

 

My 80 had the same thing done to it and the drive shaft had to be shortened and rebalanced.

 

Yes most need to be shortened, unless your the car had the longer 9" tail housing.

 

Thanks guys what is your take on the th 400 vrs turbo 350 ?

 

The th400 can handle allot more than the th350, hp/torque wise.

 

I wouldn't agree that the TH400 handles a lot more power than a TH350. If you talk with anyone from one of the aftermarket transmission companies, they wont rate their TH400 for much more than the TH350, with the exception of highly modified TH400's.
For the average high performance, or competition models of both trannies, makers like B&M and TCI rate both transmissions at equal HP levels.
If you're starting from scratch I'd go with the TH400, but if you have a TH350 now, I'd lean towards keeping a TH350, just because it's less money, and less work to replace. If you're headed towards a 500HP or greater engine, or a lot of competition, then I'd go another route than either trans.

 

I've always heard that the TH400 is bulletproof in its stock form compared to a TH350. The only thing is that is has more parasitic power loss than the TH350 due to the heavier internals.

 

You're absolutely right Kyphur! If both trannies are in stock form the TH400 is a much better choice. It's when we get into built trannies that the TH350 becomes an equal to the TH400, and from a HP point of view it has less spun mass, so doesn't rob as much HP to turn the tranny.
The 400 has a larger output shaft and slip yoke, but I've never heard of anyone tearing the yoke or output shaft on either 400 or 350. More likely you'll twist a driveline, break a u joint, and spin an axle tube.
If the engine is under 600 hp, either 350 or 400 can be built to handle it. Over 600 HP I'm not sure I'd run either; I'd probably go with a really radical Powerglide, or a manual tranny.

 

There's a bunch of powerglide guys around here. But there's a few that have 800+ hp cars with heavily built th400's that I've seen.