Can you fit a 300zx manual transmission on a 92 Pontiac grand am auto?
Chances are you cant. An import transmission will be in now way compatible with an American engine. The bell housing wouldn't match up and it would be near impossible to mount this transmission.
If you are askin g this question, I highly recommend you take the transmission to the shop and pay to get it fixed. To find a diagram, you will probably have to buy the official Pontiac auto transmission service repair manual from the dealer, unless there is a decent 3rd party book out - I doubt that.