I am trying to investigate my trans more. I was told this trans was a th350. Everything I look up seems to confirm that, but none of my numbers seem to line up with any of the info I read anywhere. Every site mentions letter codes as part of the numbers. I have cleaned and scraped every area numbers are supposed to be. I can only find 3 numbers beyond a single digit anywhere.
Number on tail housing, drivers side.
Number on drivers side behind shift linkage.
Center top, and appears on both sides.
C9. Top front of bell housing
Front driver side of bell housing

 

How about a photo of the overall trans and specifically the shape of the pan and number of bolts? The VIN derivative indicates that this trans is from a 1977 Oldsmobile, so it could be a TH350 or a TH200.

 

Pan is 13 bolts, square with corner cut.

Its not original to the car.

 

So it's a 1977 TH350.

 

Thanks Joe. I guess I was just unsure because I kept reading there should be a letter or 2 in the numbers. Nothing I found seemed to line up with the different charts of numbers I have been able to find. At least you got me far enough to get a new filter and gasket, maybe new pan as this one feels like I could put my finger through it if I tried.

Bob