M/T - Proper Service Fluid
88pontiac03Bulletin Number: 88-7-17
Reference Number: 877208
Publish Date: 2/88
PROPER SERVICE FLUID FOR MANUAL TRANSAXLE/TRANSMISSION 1986 1/2 -
Subject: 1988 HM-282 (MG1 AND MG2) 1988 HM-290 (MC0 AND MG5) HM-282 - ALL HM-290 - ALL
Models Affected:
6000, SUNBIRD, GRAND AM, FIERO AND GRAND PRIX MODELS
BULLETIN COVERS:
Proper service fluid for the HM-282 and HM-290 is important to prevent gear clash and/or increased shift effort.
FIGURE 1 - HM-282 TRANSAXLE IDENTIFICATION INFORMATION RPO MG1/MG2:
FIGURE 2 - HM-290 TRANSMISSION IDENTIFICATION INFORMATION RPO MCO/MG5:
DATE OF PRODUCTION CHANGE: (Figures 1 and 2)
For the 1988 model year the HM-282 5-speed manual transaxle is factory filled with synchromesh transmission fluid (STF). This new fluid aids in reducing cold shift effort in this application.
SERVICE ACTION:
Reference chart below for the proper service fluid.
NOTE: 1) It is permissible and preferred to use synchromesh transmission fluid (STF) in past model HM-282 transaxles. STF will aid in reducing cold shift effort.
2) Synchromesh transmission fluid (STF) can be mixed with manual transmission fluid, but as the portion of manual transmission fluid increases, so does the shift effort.
IMPORTANT: DO NOT REFILL THE HM-282 OR 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.