Ok I'm going to get a trans in the morning if I don't see any 2000 monte Carlos what other years can I go with an could I use one from a impala 3800?

 

Triple Edge Performance (around here regarded as one of the best rebuilders for our trannies) has this list on their website.

4T65E Vehicle App List

Yes the Impala should work, assuming it's within those years at the link.

I don't know the exact specifics, and hopefully someone else can jump in here, but I believe there's a year where GM started making slightly better 4T65E's and you want anything past that year. Again, I know that's arbitrary, so I apologize, but hopefully my statement will ring a bell for other's on the forum....or I'm just really crazy.

 

2003 is that year. They changed a switch from vacuum to electronic, so if you are a 2002 or lower, your PCM wouldn't hit that switch.

To the OP, try to stay with your year if possible. But any 4t65e from a 98-02 Grand Prix, Monte, Impala should work for you. Although make sure you check the RPO codes and see that the gear ratio matches

 

Where do I check for the rpo code