M/T - Proper Service Fluid

88chevy24

GMC NUMBER: 88-T-107

GROUP: 7B - Manual Transmission

DATE: April, 1988

CORPORATE
NUMBER: 877208R
SUBJECT: PROPER SERVICE FLUID FOR HM-290 MANUAL TRANSMISSION

MODELS: 1988 C/K WITH HM-290 4 SPEED (RPO MCO) OR 5 SPEED (RPO MG5) 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.