I have looked all over for the answer to this and have come up empty. I have a 72 cutlass supreme. I just cleaned the transmission, which is out of the car, and I noticed as I was degreasing, a "C4 with a + sign at the top of the trans where it would bolt up to the engine. I thought I had a TH350. Can someone help with this ID?
Thanks!
Chris

 

Can you post a picture of the pan?
Maybe it looks like one of these.
trans_pan_id.jpg

 

I'ts not a c4 i'd bet on th350,i don't know what that cast means i've seen it before.

 

I thought C4 was a Ford transmission. I know C6 was.

 

many th350's have this I have one that say's c12 and c8 . Dunno about the th400 but might be casting designation or something they used at the gm plant .

 

Thanks guys! After looking at the pics that were posted, it appears the same as the th350 pan.
Thanks again!
Chris