What Grand Prixs have the same compatible engines and transmissions as A 00 Monte SS? Or what other cars in general. I know the 04,05 GP GTP is one...

 

They pretty much run the same engines.

97-07 base N/A 3800 will be the same as yours.

99-04 ran the same M90 Supercharged engine found in the 04 and 05Monte's.
05-07 received the upgraded Gen V M90 which gave 20 extra hp.

It is also speculated that the reason that the 04-05 Monte's received the Supercharged engine is because GM wanted to clear them out from the Pontiac division to use the upgraded blower on the 05-07's.

 

By the way, welcome to forum JB!!!

 

Buick's
Pontiac Bonneville, Grand Prix
Olds
anything GM had with the 3.8

anything with the 3.8 will work in the 00 Monte