In my 69 Z/28 I have an M-22 dated P9M28. My car is an X-33 06A and through process of number calculations was built close to June 19th. My question is, there is no C code on this trans, no Vin, and its shows the wrong month, would this be a replacement? should have a Counter exchange number correct? or could have the original owner just gone to chevy parts and buy one and put it in and thats why it doesnt have the c-code? was this code only used for new builds and not over the counter buys?
Sam