usually it is the overdrive solenoid, but can be the connector to it, input to the computer, or the computer.
If your 1993 Lexus SC300's automatic transmission is not shifting into overdrive, it could be due to several issues. Common causes include low transmission fluid levels, a faulty transmission control module, or a malfunctioning governor or speed sensor. It's also possible that there's a mechanical issue within the transmission itself. It's advisable to have a qualified mechanic diagnose the problem to ensure proper repairs.
electronic solenoid
a bad radiator -automatic portion of radiator not cooling off transmission
The most common cause of a automatic transmission jerking, when shifting, is low transmission fluid. Fill the transmission to the full mark.
your transmission is about done, sell it
Assuming it is an automatic transmission, I would check the fluid level. When the transmission is warmed up, the level should read 'full' on the transmission dipstick. Check the color and smell of the oil. Does it smell burnt, or does it appear to be brown instead of red? Perhaps the filter screen is clogged.
A gear which causes the transmission output shaft to rotate at a higher speed than the transmission input shaft.
There is a push button on the end of your automatic shift lever. Pushing it in causes the Overdrive to turn on and off.
Overdrive in a 1992 Ford Ranger may not work due to several potential issues. Common causes include a malfunctioning overdrive switch, a faulty transmission control module, or low transmission fluid levels. Additionally, issues with the transmission itself, such as worn components or internal damage, can also prevent overdrive from engaging. It's essential to diagnose the specific cause to determine the appropriate solution.
Possibly low fluid.
Your transmission is breaking down inside. ether watch for it. or extensive transmission is required.