On vehicles with a manual transmission, worn shift bushings can cause the transmission to pop out of gear, especially when coasting down in 1st or 2nd gear. Replacing all the shift linkage bushings is pretty straight forward and not expensive and will commonly correct this concern.Google+
Car Problem Reports
Toyota T100 Worn Shift Bushings Will Cause Manual Transmission to Pop Out of Gear
Toyota T100 Problem
Drive Trains Affected: 2WD, 4WD
Average Mileage: 91,000 mi (50,000 mi - 121,000 mi)
Manual xmission takes a lot of effort to shift into 1,3 and 5. Clutch fully disengages; plan to take to dealer if I cannot find a known solution. I found the solution for my issue - bought Toyota P/N 33505-35020 (Seat Sub-Assy) and installed it by removing the floor shifter (find instructions on internet) and using a hemostat to remove all of the pieces from the old, broken down piece. Installed new piece and everything is perfect now.
Visitor, 1993 Toyota T100, 4WD, 50,000 mi
I currently have 120k miles on my truck. I have had these bushings replaced a couple of times. It's staring to pop out of gear again so I anticipate replacing these again soon.
Visitor, 1994 Toyota T100, 2WD, 121,000 mi
1994 T100 2.7L 2wd with 5-speed hard shifting in gear at times - sometimes pops out