At higher mileages, (125,000-150,000) the automatic transmission may not shift correctly. This can be caused by the throttle position sensor being out of adjustment or a shift solenoid needing to be replaced. Typically the transmission does not need to be completely overhauled.
Car Problem Reports
Toyota Corolla Automatic Transmission May Not Shift Correctly at High Mileages
Toyota Corolla Problem
Drive Train Affected: Automatic Transmission
Average Mileage: 181,600 mi (125,000 mi - 250,000 mi)
Visitor, 1995 Toyota Corolla, Automatic Transmission
will not shift into overdrive when it should. It kills your gas mileage because you are in Drive on the freeway rather than overdrive. Even if you slow down, it still doesn't shift. I have 180k on my 95 Toyota
Visitor, 1997 Toyota Corolla, Automatic Transmission, 133,000 mi
Doesn't always shift from 3rd to 4th, especially in colder temperatures.
Visitor, 1993 Toyota Corolla, Automatic Transmission, 180,000 mi
Corolla was starting out in 3rd gear and staying there. Was quoted new transmission by local mechanic. Took it to Mr. Transmission instead and was notified not even an hour later that the transmission was fine but the solenoid was dead. Solenoid replaced for MUCH cheaper than new transmission :-).
Visitor, 1995 Toyota Corolla, Automatic Transmission, 125,000 mi
Trans made bad noise for about 100 highway miles - shifted out of 3rd gear and never went back in. Trans was fully replaced. Problem fixed.