Used transmission 2000 Pontiac Grand Prix GTP?

Answer 1

Lots of luck trying to find one - they made 2 types - XAB and XBB

There will be a tag, under the engine(trans) in about the center of the car to tell you which one you have. The dealer told us they are NOT interchangeable! However, they ARE interchangeable. The only issue would be that the XAB trans is not as stong as the XBB, specifically the sprag clutch. So while

The only other cars produced with the XBB trans was the Buick Regal GS (supercharged), and the Buick Riviera (supercharged). The XAB appeared in all W-Body vehicles GM made, but if the engine isn supercharged, it will be a 4T65e NON-HD (as opposed to the 4T65e-HD in the blown cars).

Without the HD option, the supercharged 3.8 will obliterate its bands and clutches, among other things.