W350 1 Ton Pickup 4WD V8-360 5.9L VIN 1 4-bbl (1988)
Torque Converter: Testing and Inspection
No Lock-Up
1.
Faulty input shaft or seal ring.
2.
Leaking turbine hub seal in converter.
3.
Failed locking clutch in converter.
4.
Failed lockup relay.
5.
Failed lockup solenoid.
6.
Solenoid wiring disconnected.
7.
Sticking lockup solenoid.
8.
Sticking fail-safe valve.
9.
Sticking lock-up valve.
10.
Sticking switch valve
11.
Valve body malfunction.
12.
Sticking governor valve.
13.
Faulty oil pump.
