SOURCE: transmission sometimes shifts hard into next gear.
Typiclly this is caused by a failing Pressure Control Solenoid. Now in some cases, since you are in the 1996 model year you may have a vacuum modulator that controls the shift firmness that can be replaced as it is externally mounted. I dont know how best to describe what it looks like, but look down on your transmission, on the front side facing the radiator and if you see a canister like device that has a vacuum line running to it, that is the vacuum modulator and you could start by replacing that and see if it helps.
If you do not have the vacuum modulator and have instead the electronically controlled version of your transmission then you will have a Pressure Control Solenoid and it, unfortunately, is located on the inside of the transmission and cannot be easily replaced without dropping the whole transmission.
The pressure control solenoid is a common issue with your transmission (4T65) and Im leaning more towards you have the electronically controlled version (4T65E).
SOURCE: gear shift knob
Usually there is a small metal clip at the bottom front of the shift knob (looks like a staple.) Just pull it out and pull the knob straight up.
SOURCE: R & R 1991 Lexus Ls400 Gear shift knob
slide the lower part of shifter handle down and you will find two screws, but there is 2 wires coming in from center console for overdrive button.you have to remove the center console cover and remove the 2 wires from connector and then pull up threw handle.when you go back together you will have to guide them back threw the handle.
SOURCE: 2004 Buick Regal. Hard tranny shifts.
Try some Lucas Transmission fix. that stuff has done wonders for almost all of my tranny problems
SOURCE: 1999 Buick Regal GS gear shift knob button is stuck to release
Check in your fuse panel. The top first row and the first fuse. I took that fuse out and had the same problem. My gear shift button was stuck. I put the fuse back in and it worked.
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