Drivetrain - Disengaged Front Axle Shaft

85-165
4C
DEC., 1985
Subject: FRONT AXLE OUTPUT SHAFT RETENTION
Model and Year: 1983-85 T10 4-WHEEL DRIVE PICK-UP TRUCKS AND T10 4-WHEEL DRIVE BLAZERS

Figure No. 1:

During the 1985 model year, a design change to the front driving axle assembly was made to the improve axle output shaft retention. The modification, in the shape of the differential side gear is shown in Figure No. 1.
Disengagement of the axle shaft may cause internal damage to the differential and axle shaft, but will not cause the shaft to separate from the vehicle. In the event of a disengaged front axle shaft on 1983-85 Truck, follow the service procedure specified below.


SERVICE PROCEDURE

1. Remove and disassemble the tube and axle shaft assembly, differential carrier and differential case following the procedure outlined in Section 4C of the 1984 or 1985 S Truck Service Manual.

2. Replace both output shaft retaining rings, part number 14041989.

3. Replace the differential side gears with new part number 15521971.

4. Replace the differential connector gear with new part number 15521970.

5. Inspect for any additional worn or damaged parts and replace as necessary.

6. Reassemble the differential case, carrier assembly, and axle shaft and tube assembly following the procedure in the 1984 or 1985 S Truck Service Manual.