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GP99GT · 06-30-2008, 03:18 PM

the transmissions are just like every other newer FWD GM transmission...about 130k miles and itll be ready for a new one. the one in my GP GT lasted til 141k before i lost 3rd gear completely (was slipping for a few thousand before that)

difference between the GTPs trans (4T65E-HD) and a non-supercharged 3.8 trans (4T65E) is the HD has a stronger differential and one of the axles is shorter...

97-98 GTPs have a few differences. 99+ has a revised coolant overflow bottle for instance...so try to get a 99-up, the newer the better basically.

they all use the same eaton M90 supercharger. s/c bearing/coupler is somewhat common on them but not a hard thing to replace, and its easy to tell if one youre looking at buying needs one - the supercharger will rattle like crazy

06-30-2008, 03:18 PM	#22
GP99GT Mr Fantastic Join Date: Aug 2004 Location: West Milford NJ Posts: 7,917 iTrader: (2)	the transmissions are just like every other newer FWD GM transmission...about 130k miles and itll be ready for a new one. the one in my GP GT lasted til 141k before i lost 3rd gear completely (was slipping for a few thousand before that) difference between the GTPs trans (4T65E-HD) and a non-supercharged 3.8 trans (4T65E) is the HD has a stronger differential and one of the axles is shorter... 97-98 GTPs have a few differences. 99+ has a revised coolant overflow bottle for instance...so try to get a 99-up, the newer the better basically. they all use the same eaton M90 supercharger. s/c bearing/coupler is somewhat common on them but not a hard thing to replace, and its easy to tell if one youre looking at buying needs one - the supercharger will rattle like crazy __________________ Matt B18B1 FTW Last edited by GP99GT; 06-30-2008 at 03:19 PM.