My 1984 corvette transmission is not shifting into overdrive. It shifts first thru third fine.
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.
what would transmission not to shift in to overdrive
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.
a broken dip stick wont cause hard shifting... the engine does not do the any shifting... your problem would be the transmission... check transmission....
the overdrive sencer
The most common cause of a automatic transmission jerking, when shifting, is low transmission fluid. Fill the transmission to the full mark.
Several things can cause Chevrolet Corvette gear shifting problems. Broken gear shift linkage is the most common problem. Worn gears in the transmission is also common.
If you are city driving, and stopping at many lights. The tranny might be shifting into overdrive constantly for just a few seconds before you have to stop again, which would cause excessive wear on an expensive transmission. Personally, in this situation I would disengage the overdrive.
Your transmission might automatically shift out of overdrive while driving on the interstate because of low transmission fluid. This issue might also occur because of a bad transmission sensor or overdrive sensor.
If the transmission is healthy and any/all adjustments are done properly there should be no slippage.
For most drivers, Overdrive should be used full time. Its designed to reduce the amount of effort the engine needs to maintain speed. Whenever a lot of shifting is taking place, its recommended to only used Drive. Roads with a lot of hills, curves, or heavy traffic areas should not use overdrive to prevent damage to the transmission. Also, disengage overdrive whenever towing. There is not enough torque generated by the engine to tow while in overdrive. Towing while overdrive is engaged can cause damage to the engine and transmission.