Your problem looks like there is no 4th gear
One thing you could do is :
1. Drive your car at a steady speed and cruising while your right foot is on the gas pedal with your left foot just touch a little bit the brake pedal just to release the brake switch and look the RPM should drop of 300 to 500 rpm in 3th gear. If so, you have the TCC (Torque Converter Clutch) applied next.
2. Retrieve the engine code with a scanner to see if there is any faulty transmission or engine code.
3. If you have code register than you have to solve the code first.
4. After the fix is done erase code so the PCM (Powertrain Control Module)will reset to normal.
5. Test drive to see if your problem is solved.
P.S.: Transmission fluid is very important. Do a transmission flush if you doubt.
Hope it helps.
SOURCE: 2000 grand prix w/auto transmission wont shift into overdrive
some of the trannys has straps in them that sometimes needs to be tightened and that could be the cause of it
SOURCE: car shifts
Hi I am Vortash sounds like Torque slip check your fluid levels in the transmission. Rpm will rise if there is weak drive then as the vehicle reaches change speed it will snatch because the rpm is high .. if your levels are ok you may need to get your Torque converter checked out .. hope this helps regards Vortash
SOURCE: 99 Grand Am. No reverse
Hello and welcome to FixYa!
Looks like a faulty torque converter to me. If the torque converter is faulty, it shifts hard or may stay on a certain gear. Reverse can be affected too. I strongly suggest that you have a torque converter replacement if that's the case.
Before going to torque converter replacement, please do check the transmission fluid. If it looks or has a burnt smell then it can be the issue too. Burnt fluid may cause irregularities on transmissions operation. If that's the case then go for the fluid replacement first and if it still fails then it's time to have a new torque converter.
Hope this helps and thank you for using FixYa! Have a good one!
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