The first two steps are check the fluid and check the computer for trouble codes.
No, the alarm will not affect the trans.
The transmission computer uses it to know the rotating speed of the input shaft.
No, but it can cause the trans computer to not be able to communicate. that will cause not shifting.
The TCM should only prevent the transmission from shifting properly.
Yes The computer that controls the transmission relies on these to decide when to shift.
The transmission linkage connects the shifting the lever in the passenger compartment to the shifting lever on the transmission. You will find the shifting linkage on the side of the transmission.
There are several things that can cause shifting problems in your 1989 Chevrolet Blazer transmission. The most common cause of shifting problems is a lack of transmission fluid. Broken shifting forks can also cause transmission shifting problems.
would an automatic transmission car jerk when shifting after having had a transmission flush
The engine computer controls engine functions, transmission- shifting, HVAC- heat and ac, ABS- braking, Airbag- restraints, etc.
When a 1998 Chrysler Sebring makes noise while shifting the transmission should undergo a fluid change. Dirty fluid can cause hard shifting. The engine should also be given a diagnostics test to see if all the sensors are functioning correctly.
The most common cause of a automatic transmission jerking, when shifting, is low transmission fluid. Fill the transmission to the full mark.
Sorry to tell you this, but I'd get it to a shop ASAP which can diagnose it. It sounds like you have a transmission problem. When the transmission fails it defaults to being locked in 2nd-gear which is called "limp-home" mode.