check for a failed vacuum modulator or a vacuum leak to the vacuum modulator. It sounds like you are shifting on the governor or engine management unit.
The most common cause of a automatic transmission jerking, when shifting, is low transmission fluid. Fill the transmission to the full mark.
The real problem is manually shifting from gear to gear with an automatic transmission. If you are referring to the automatic upshift, there may be a problem with the EGR system or vacuum system.
There can be several things that will an automatic transmission not to work properly. The most common cause is a lack of transmission fluid. Broken shifting linkage can also cause the problem.
Transmission temp sensor can cause a slip or high rpm before shifting to next gear.
Try changing the transmission fluid and filter
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.
check the fluid level. if it is low it ill cause the tran. to shift late
It is possible. Replace any broken mount, and this will eliminate the possibility.
broken transmission mount there is a front left, rear left and a center mount
A seized up transmission can cause a Volkswagen Golf with an automatic transmission to not shift and racing RMPs after second. A worn gear can also prevent shifting.
Allison transmission not shifting
Several things can cause your transmission to be stuck in second gear. Broken or detached shifting linkage will cause the problem. A broken shifting for in the transmission can also cause the problem.