Full Size Chevrolet V8-350 5.7L DSL (1984)
Valve Body: All Technical Service Bulletins
Engine - Stops Running in Reverse Range
86-7
7A
NOV., 1985
Subject:
ENGINE STOPS RUNNING WHEN IN REVERSE RANGE
Model and Year:
1984-1986 THM 200C TRANSMISSIONS
200-C PRESSURE REGULATOR VALVE (PART #8638950)
TO:
ALL CHEVROLET DEALERS
Some vehicles equipped with 1984, 1985, and early 1986 THM 200C transmissions may exhibit a condition which may cause the engine to stop running
when the transmission is placed in reverse range. This condition may be caused by transmission fluid leaking across the pump gear causing the torque
converter clutch (TCC) to engage. This condition can be aggravated by hot transmission oil, high line pressure demand, low idle speed, and large pump
drive gear side clearance.
A pressure regulator valve with two flats ground between line and converter feed lands (Refer to Illustration) will prevent transmission fluid leakage
across the pump. It is scheduled for mid 1986 production.
If this condition exists, order and install service package part number 8638951 which contains a pressure regulator valve part number 8638950 and
instruction sheet part number 8638952.
Refer to the appropriate Service Information Manual for proper installation procedures.
