bought a used 93 Grand Prix. but the automatic transmission was shot and now I can't replace it because I can't determine what model is in
I'd call a local trans shop to get a list of compatible transmissions.
Also I'm pretty sure there is an identification plate on the transmission. Do a bit or Googling to find out where its located then take a good light and get underneath and find it. It's pretty important to get the right one if you want everything to work properly.
Search Pontiac Grand Prix Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Pontiac Grand Prix Experts