Since you have a GXP, you will fall under the volvo failure rate: Volvo S80-XC90
Long sliding shifts:
This problem is one that most 4T65E transmissions experience sooner or later. The factory design didnt allow enough compensation for wear- so the result is normally poor shift feel and long or lazy shifts, especially the 1-2 shift which leads to eventual failure. The 2nd clutch clearance from the factory is set very loose and as wear occurs this will grow and make the shift feel worse. General wear inside the transmission also causes apply pressure to drop with age so these two problems add up and this is one area that does not need to be short handed on pressure. The 1999-2002 models are also well known for pressure control solenoids prematurely failing and can cause low line pressure that the TCM cannot control. Often times if the transmission has low mileage and is in good internal condition you can upgrade the factory 1-2 and 2-3 accumulator parts with ones from a Transgo Shift Kit and this is a good aid to help get clutches to apply when they should. A shift kit does not make up for excessive clutch clearances but does speed up the time the clutch will apply.
Originally Posted by matt5112
