1977 Gmc J9500 Recalls

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NHTSA Campaign Number: 77V172000
Manufacturer: GENERAL MOTORS LLC
Manufactured Begin Date: March 1st, 1976
Manufactured End Date: June 1st, 1977
Date of Owner Notification: October 31st, 1977

Defect Summary:
THE FRONT AXLE ALUMINUM HUBS ON THE INVOLVED VEHICLES MAY CONTAIN A DEFICIENCY IN THE BARREL AREA BETWEEN THE INNER AND OUTER BEARINGS WHICH MAY RESULT IN CRACKS WHICH COULD EVENTUALLY LEAD TO HUB FAILURE.

Corrective Summary:
DEALER WILL INSPECT AND REPLACE FRONT AXLE ALUMINUM HUBS WITH STEEL HUBS, WITHOUT CHARGE TO OWNER.

Recall Notes:
VEHICLE DESCRIPTION: HEAVY TRUCKS EQUIPPED WITH FF931 FRONT AXLES AND MOTORWHEEL ALUMINUM FRONT HUBS.SYSTEM: WHEELS; ALUMINUM HUBS.CONSEQUENCES OF DEFECT: WHEN HUB FAILURE OCCURS, THE SEPARATED HUB IS RETAINEDON THE AXLE SPINDLE BY THE WHEEL BEARING ADJUSTING NUTS. CONTINUED VEHICLEOPERATION AFTER A HUB SEPARATION CAN RESULT IN 1) BRAKE ASSEMBLY LOCKUP ANDCONSEQUENT LOSS OF VEHICLE CONTROL, 2) EXCESSIVE HEAT GENERATION RESULTING FROMTHE BRAKE LINE TOUCHING THE BRAKE DRUM WHICH WILL CAUSE A TIRE BLOWOUT AND 3)PROGRESSIVE DAMAGE TO THE HUB WHICH WOULD ALLOW THE HUB, WHEEL, AND TIRE TOBECOME DISENGAGED FROM THE VEHICLE.NOTE: INITIAL HUB SEPARATION MAY BE ACCOMPANIED BY A DISTINCT SOUND AT THEMOMENT OF SEPARATION, ALONG WITH THUMPING OR WHEEL WOBBLE.