Chevy Tranny ID [Archive]

2GTalonTSI

12-13-2006, 11:49 AM

I need help Identifying a Chevy transmission, how do you tell the difference between a 400 and 350 auto transmission? I am trying to help my uncle find/replace the transmission in a 82 Chevy 4x4.

oh and can one replace the other? ie. bolt patterns and length, mounting points.

Thanks for any help.

Hilly

12-13-2006, 01:06 PM

TH350 has a square pan with one of the rear corners cut at an angle. TH400 is rectanular shaped with the rear coming to a sort of point. They will both bolt to the block but the trans mounts are different. There are also long/short shaft versions of both. Take a pic of what u have and I'll tell you what you have.

twotons

12-13-2006, 06:16 PM

very easy way to tell is, vacuum module is on rear of pan on th350 and the moduel is on fron right side of pan on th400.

2GTalonTSI

12-13-2006, 07:23 PM

Thanks guys, it is a bit soggy out there, will take pics as soon as I can. Appreciated.

Mark.

Trannyman

12-13-2006, 09:42 PM

WOW with that knowledge that would make you a Transmission experts! 30 Years ago! LMFAO