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So I need some help identifying the transmission on my 69 Cutlass. I figure it's a TH400 considering my Cutlass has a 455cid Olds engine in it but I'm not quite sure. I have some pictures of the pan and of some id I found just before the drive shaft. If you can't read it, the pan says, "Hydramatic Division of GMC" however I couldn't make out the last letter on the GMC part
Tail housing of TH400 is attached with 6 bolts.
Lesser models have four.
Well, the TH375 is probably also a 6-bolt tail housing.
The hex vs 4-bolt pattern is extremely obvious.
Is there a trans ID tag on the RH side, flat tag nailed to the trans in the center of the tag? It will have good info.
