PROPER SERVICE FLUID FOR MANUAL TRANSAXLE/TRANSMISSION

MODELS: 1988 C/K WITH HM-290 4 SPEED (RPO MCO) OR 5 SPEED (RPOMG5) MANUAL TRANSMISSION

Proper service fluid for the HM 290 is important to prevent gear clash and/or increased shift effort.

Proper fluid is:

Manual transmission fluid P/N 1052931 (1 qt.) .946L

IMPORTANT: DO NOT REFILL THE HM-290 WITH ENGINE OIL OR AUTOMATIC TRANSMISSION FLUID. THESE HAVE DIFFERENT FRICTION COEFFICIENTS AND DO NOT WORK WELL WITH THE SYNCHRONIZERS CAUSING GEAR CLASH AND/OR INCREASED SHIFT EFFORT

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.