TCC ENGAGES IN REVERSE STALLS ENGINE/2004R OR 700R4

MODELS AFFECTED: 81-84 - DE VILLE & BROUGHAM ("C"-"D"-RWD) 85-86 - FLEETWOOD BROUGHAM ("D" RWD)

Some 1981 through the current production model year vehicles using THM 200-4R transmissions may experience a condition where the engine stops running, or lugs, when shifted from Park/Neutral to Reverse or Drive. This condition may result from torque converter clutch engagement when either gear range is selected, and may be caused by improper operation of the converter clutch valve, located in the pump cover (Refer to Figure 1).

IMPORTANT: Prior to servicing the pump assembly for the above condition, make certain that the engine is properly tuned to specifications.

If this condition exists, inspect the pump assembly as follows:

- Check for an improperly seated or missing retaining ring (Figure 1, Item 225). Verify that the retaining ring is installed with the rounded edge of the ring facing the valve stop (item 226). Refer to Figure 2.

- Verify that converter clutch valve (item 227) and valve bore are free of nicks or burrs.

- Check for missing, broken or damaged converter clutch valve springs (outer spring item 228 and inner spring item 229).

- Verify that the retaining ring groove is not too shallow for the ring to seat, preventing adequate retention.

Refer to the appropriate Service Information Manual for removal and installation procedures.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.