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 Pickup Automatic Transmission May Not Shift Correctly at High Mileages
Toyota Pickup Problem
Drive Train Affected: 2WD
Average Mileage: 159,000 mi (100,000 mi - 218,000 mi)
Visitor, 1992 Toyota Pickup, 100,000 mi
1992 toyota pickup has trouble shifting to and or will not shift into high gear
Visitor, 1990 Toyota Pickup, 2WD, 218,000 mi
Sometimes drives ok, shifting late, or not shifting above third. Other times it won't shift beyond first. Added transmission seal repair, and this seemed to help for a week or so. It's being worked on right now and the kickdown cable is locked in position. We shall see ...