Hello, I have been working on my 72 Oldsmobile Cutlass Flame Orange 455 Four Speed Convertible. I have tried to down load some photo's with no luck.
I have completed all body work, suspension, located a very pristine front bench seat, correct motor and now I need the correct tranny.
Can someone answer what the correct casting number for the 4 speed would be? also should it be a Rock Crusher or M21?

Any suggestions on down loading the photo's would be great.

Thank You

 

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The transmission should be a Muncie wide ratio M-20 with a fine spline input shaft, which was the only 4 speed trans that Oldsmobile used in 1972. The casting should be 3925661. Really clean trannys should have a 1 inch high “WD” stenciled on the side, and there may be a bolt-on metal tag with seven digits and then "WD". (Some sources reference "WT" as the code. I've had six 1972 factory 4 speed cars and all were WDs). The last 8 digits of the VIN should be stamped on the transmission where the housings split apart.

I'd still like to get some good "before" and "in progress" pics of the car for my V Code registry. Thanks.
Terry

 

Thank You so Much for the Help. Ok the search is on for the tranny. I will work on getting the photo's up of the project. Give me a wrench over a key board anyday.