Mabee not the place

[bonezarally]

I need some help to figure out what trans i have in my 87 Chevy full size truck w/4.3 v 6:confused:

[442_ExpreSS]

Is it a auto? Should be a 700 overdrive.The pan will be completely square.
I don't think they had yet switched to the 4l60E in 87.

http://www.442.com/oldsfaq/oftrn.htm#TRAN Auto Transmission Identification

[keith455]

look at the pan and match it up to this website
http://www.nastyz28.com/chevy-transmission-identification.php

[MrRocket]

1987 was the last year for the TH400 right?