If all gears are shifting hard, may have a code p1811 set-trans adapt long shift. When this code sets it commands full line pressure causing hard shifts. Usually the pressure control solenoid is at fault. You need to have it scanned for codes.
SOURCE: 2002 Pontiac Grand Prix Thermostat
as you face the engine the thermostat bell is on the right (drivers side) Follow the radiatoe hose. Remove the two bolts and raise the bell still attatched to the hose. the thermostat is there with the rubber seal. You can gently pry the thermostat out with a screwdriver or something similar. Put in new thermostat be sure it is the same as the old one, and then replace or change the seal (be sure it is the smae size and thickness as the old one as I got the wrong size from Napa) Then replace the bell, and tighten, but not over tighten. I hope this helps!
SOURCE: 2001 Pontiac Grand Prix Gt not shifting into OD
this trans is the 4T65E. It needs a 4th clutch hub. The splines strip off around 120k or more because they weren't hardened from the factory. The new ones have the hardened splines. The trans needs to come out and be partially torn down. I've fixed alot of these. Change the EPC solenoid while you are there. They wear and hang up causing intermittent harsh shifts
You can drive them forever without changing the hub but you'll never have 4th gear
SOURCE: how to change light bulb in the gear shift of 06
Remove the center console.
There will be a bulb underneath the PRNDL(Park, Reverse, Neutral, Drive, Low) - quarter turn to the left. Pull bulb down; put new bulb in - put back in hole quarter turn to right - reinstall center console...
SOURCE: my pontiac grand prix will not shift out of park
do the brake lights work? if not the park lock out solenoid will be inop and will not pull lock out pin back to release park. let me know.
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