W150 1/2 Ton Pickup 4WD V8-318 5.2L VIN Y FI (1988)
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Torque Converter Clutch Solenoid: Testing and Inspection
Remains Locked-Up at Too Low A Speed In Drive
1.
Failed lockup relay.
2.
Sticking lockup solenoid.
3.
Sticking fail-safe valve.
4.
Sticking lock-up valve.
5.
Sticking switch valve.
6.
Valve body malfunction.
7.
Sticking governor valve.