im guessing you have a 700r4 its is time to get a rebuild but for your answer it could be a valve body problem or possibly the 3rd and 4th clutches and sprags are bad
A "speed" sensor can affect the shifting of the trans.A "speed" sensor can affect the shifting of the trans.
The speedometer signal comes from the ABS sensor on top of the rear axle. The trans also has speed sensors on it for trans shifting.
Be sure the trans is full with the proper lubricant.
Be sure the trans is full with the proper lubricant.
check pig tail at speedsensor at rear at trans case or trans. or if that fails change vehicle speed sensor
Possibly depending on the car and trans type, vehicle speed can be a major component in shifting strategy.
MORE THEN LIKELY IT IS THE SPEED SENSOR ON THE TRANS I HAD A SIMILER PROB ON MY TRUCK
it may be the slave cylinder or clutch master cylinder
The speed sensor needs replaced. It is on the trans.
Trans output speed sensor.
I have an 86 and it has the A200R4 trans. If you have an overdrive position on your shifting column then that is what you have, if you only have a 3 speed then you probably have a turbo 350.
It probably has a rev limiter built into the computer.