Hey Guys Gals and Mr Trannyman We have a 2000 GTP 3800 Series 2 car. We have never had a tranny issue before with the car and in fact if we had not taken it on a highway drive I doubt my wife would have even noticed. However with me driving I quickly found out there is an issue. 1-2-3rd are all perfect, no slipping shifts solid. However if left in 4th it never gets there, and when its suppose to shift it never does, and when you lift off the throttle the revs just drop down to idle until you step on the gas and it reaches back to where 3rd gear rpms would be at. If you leave it in 3rd it will zip along fine, 75mph at 3000rpms. Lift off the throttle the rpms stay put and the car slows down. Put it back into 4th RPMS stay at 3000rpms but when you lift off now they drop to around 1000rpms until you step on the gas again they spool back up to 3000. Shifting the shifter from 3-4 and 4-3 makes no difference aside from the rpms being able to drop. The car has 137,000 miles on it, and before we owned it, it was owned by an older couple that did all Dealer Service and the car had Zero mods done to it. Only thing I have done is plugs, wires, cone filter and lube job.
I did notice when the problem happened, that the car was about 1qt low on trans fluid, below the add line, but still showing on the dipstick.
