Hello
I have a 2008 Pontiac Grand Prix GXP 5.3L v8. with the 4T65E-HD 123,000 miles
randomly when i am at a stop and i go to hit the gas my RPMs rev up and the car doesnt move then it drops/clunks into first.. Any ideas why? seems to shift smoothly, Some time rpms flair back in forth between overdrive.. going around 50 mph.. I have the TransGo shift kit (only the springs, parts that could be accessed from below tranny) installed on it.. Fluid and filter change more then 4 times.. along with a new magnet for pan...
Thanks