Hello!
I just found this forum today. I have an '01 Impala, not a Grand Prix. I hope I'm not chastised too much, lol... I purchased it a couple of years ago from the original owners, who bought it new. I have a stack of receipts from all of the service/repairs done over the years. 244K miles on it at this point. I'm having a little bit of a transmission issue now, so I'll be heading over to the trans section from here.
Dave