SOURCE: 99 buick regal will not start gears will not shift
possibly ignition switch issue, remove the lock cylinder and manually jump the wires, if that works, replace the switch
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: transmission plugs different
Not if one is a 4t60e and the other is a 4t65e, they are not interchangable. The 1995 should be a 4t60e, It has a round plug toward the radiator and also has a vac modulator. The 2000 should be a 4t65e, It has a bigger round plug coming through the top of the side cover, toward drivers fender, and no vac modulator.
SOURCE: 2003 BUICK REGAL TRANSMISSION PROBLEM.
This is a common problem on some GM cars. There is a pressure control valve in the side cover of the transmission that needs to be replaced. The transmission does not have to be rebuilt. You will need to get a side cover gasket also.
SOURCE: 2004 Buick Regal. Hard tranny shifts.
Try some Lucas Transmission fix. that stuff has done wonders for almost all of my tranny problems
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