A/T - Fluid Usage (Cold Weather Shiftability)
88pontiac07Bulletin Number: 88-7-31 Reference Number:
Publish Date: 837205R 5/88
Subject: TRANSMISSION FLUID USAGE
Models (COLD WEATHER SHIFTABILITY)
Affected: 1983-88 SUNBIRD, GRAND AM AND FIERO WITH ISUZU 5-SPEED MANUAL TRANSMISSIONS
Some owners of the above vehicles may comment of gear clash and/or high
shift effort during cold weather operation. If this condition is
reported, drain the transmission and refill it with STF (Synchromesh Transmission Fluid). After draining and repairing any 1983-88 Isuzu 5-speed manual transmission, it is strongly recommended that only STF be used to refill the unit. Refilling the unit with 5W-30 manual transaxle fluid, P/N
1052931, is acceptable; however, it will not provide the lower shift efforts that the newer STF provides. The most notable reduction in shift effort will be during cold weather operation.
Mixing STF with 5W-30 manual transaxle fluid, P/N 1052931, is also acceptable, however, as the volume of 5W-30 increases so does the shift effort.
NOTICE: DO NOT USE ANY AMOUNT OF ATF (AUTOMATIC TRANSMISSION FLUID) IN ANY MODEL YEAR. THE USE OF ATF MAY CAUSE GEAR CLASH AND RESULT IN SYNCRONIZER DAMAGE.
Service Parts:
STF P/N 12345349
5W-30 Manual Trans. Fluid P/N 1052931