What type of transmission is in 1998 Pontiac GTP?

The 1997-2003 Pontiac Grand Prix GTP is equipped with the 4T65E-HD "heavy duty" transmission, as opposed to the 4T65E transmission equipped in the GT model. The GTP transmission is different from the transmission in the GT in the sense that it is equipped with a different planetary gearset, and is capable of handling more power and torque. Hope this helps!