ATF temperature sensor

Refer to Diagnostic System Check - Vehicle

Line pressure solenoid

Refer to Diagnostic System Check - Vehicle

Shift switch positioning

Refer to Diagnostic System Check - Vehicle

Transmission control module (TCM)

Refer to Diagnostic System Check - Vehicle.

Reverse clutch

Burn or wear of the low clutch. Refer to Reverse Clutch Disassemble.

Low and reverse clutch

Burn or wear of the low and reverse clutch

Broken or damaged oil pump

Seized or broken pump gears

Control valve spool

Missing steel ball in control valve