Campaign - M/T Replacement Required: Overview
89Pontiac22Number 89-C-07 Date 09/89
Subject: PRODUCT CAMPAIGN 89-C-07 MANUAL TRANSAXLE WITH HIGH CARBIDE GEARS
MODELS AFFECTED CERTAIN 1989 GRAND AM AND
SUNBIRD MODELS WIT 5-SPEED MANUAL TRANSAXLE (RPO MG1 OR MG2)
TO: ALL PONTIAC DEALERS
General Motors has determined that certain 1989 Pontiac Grand Am and Sunbird models were produced with 5-speed manual transaxles which may have gears with a high carbon content in the tooth surfaces. These gears could, as mileage accumulates, damage the softer gears to which they mate. The first notice to a driver would be gear noise resulting from spalling (pitting) of gear surfaces. If the transaxle is left unserviced, internal damage may occur, leading to vibration or the shifter "popping out of gear," and finally to a loss of drive in one or more gears.
Up to ten different gears in each of the involved transaxles may have excess carbide, hence the involved transaxles are to be replaced to prevent the above condition from recurring on the same vehicles as mileage accumulates.