Probably not what your looking for........ Marco, I don't know if a non-Buick will help you? My Dad's 71 T-37 400 4spd car has the #'s matching M-21 in it. Anything on this that might help you? Let me know.
Pick me, Pick me!!!!! Marco, The Nats were GREAT!!! I still have my no's matching M21 in my '70 stage 1 car. Let me know what you need. John
My 68 Ramrod still runs the numbers matching M20 in it. We'll pull the numbers next time it's on the hoist. Got the VIN # already. :grin:
Thanks everyone. Basically, I'm looking at the Muncie code stamping relative to a car's assembly date. Any GM make/model, 1967 - 1974 assembled in August throught January, as long as it has it's originall matching #s Muncie. Thanks :beer
Also just bought a 4 speed numbers match 69 Cutlass post coupe last night that has the original M20 in it also. Haven't got it home yet, will check it when I get it home. Ramrod was built in April, why only interested in August through January?
Thanks Dave. In a nutshell, I'm trying to gather information that early model year cars had transmission date codes that preceded the build dates by about 1 month and the year in the transmission code (added in 1969) was actually the model year of the car it was going in, not the calandar year of the transmission's build date.
I can only speak for Oldsmobile, but I think it also applies to all GM. The VIN stamp started in 1968 and is the only thing on the transmission that's tied to the car build date. 1968 manual transmissions (3 speeds and 4 speeds) carried over at the end of the model year into 1969, so the early cars could easily have very old build dates. Also we didn't work with modern inventory management systems back then like today. They hadn't even heard of LIFO or FIFO, we used the FISH system. (First in stays here), filled the warehouses, then worked off the floor and incoming. A lot was kept there as safety stock and that can get very old.
