REAR AXLE DIFFERENTIAL NOISE (SERVICE PROCEDURE)
SUBJECT: REAR AXLE DIFFERENTIAL NOISE/INOPERATIVE (SERVICE PROCEDURE)
VEHICLES AFFECTED: 1990-92 "C6H AND C7H" TRUCKS EQUIPPED WITH EATON 19050 SINGLE OR TWO SPEED REAR AXLES
CONDITION:
--------- Some 1990-1992 C6H and C7H TopKick/Kodiak Trucks equipped with Eaton 19050 single or two speed rear axles, may experience a noisy differential which may lead to an inoperative rear axle.
CAUSE:
----- This condition is most prevalent in off road applications and is caused when the differential side gears wear and affect other differential components.
CORRECTION:
---------- This condition can be repaired by cleaning the entire rear axle cavity, replacing damaged differential components, checking rear wheel bearing adjustment, installing smaller diameter axle shafts and refilling the axle cavity with synthetic lubricant. Refer to axle shaft replacement and rear wheel bearing adjustment in the medium duty service manual.
SERVICE PARTS INFORMATION:
Part Number Description Quantity ----------- ----------- -------- 12345841 1 Gallon Synthetic Lubricant Eaton 190505 (RPO H11) - 4 Eaton 19050T (RPO H17) - 5 12542989 LH, RH Axle Shafts 2
WARRANTY INFORMATION:
Labour Operation Description Time ---------------- ----------- ---- F1540 Right Axle Shaft Replace 0.3 hr. F1541 Left Axle Shaft Replace 0.3 hr.
Note: For Other Labour Operations, applicable to differential repair, refer to the labour time guide.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
