Service Procedure

FIGURE 1 - AXLE SHAFT AND HOUSING:

Refer to Figure No. 1 for Axle Shaft and Housing Detail.

After performing brake work ensure brake system is operational before returning the vehicle to the owner.

All involved trucks are equipped with an 8.5" ring gear semi-floating rear axle. Refer to Section 4B, Rear Axle, and Section 5, Brakes, of the 1986 Light Duty Service Manual (ST-330-86) for further removal or installation instructions.


1. Place transmission in neutral.

2. Lift and support vehicle.

3. Remove tires from rear axle.

4. Remove and discard brake drums.

5. Disconnect the parking brake cables at the equalizer.

6. Remove differential cover and catch the oil in a drain pan.

7. Disconnect the brake line at the wheel cylinders and catch the fluid in a drain pan.

FIGURE 2 - DIFFERENTIAL ASSEMBLY:

FIGURE 3 - PINION SHAFT ASSEMBLY:

8. Remove screw (A), pinion shaft (B), and "C"-lock (G) from the differential case, Figures No. 2 and No. 3.

9. Withdraw axle shafts and set aside.

10. Remove and discard the complete brake assemblies. This includes the backing plate, attaching hardware and parking brake cable.

11. Install new brake assemblies on the axle. Torque backing plate bolts to 47 N-m (35 ft.lbs.).

12. Reconnect brake line to the wheel cylinders. Torque to 18 N-m (160 in. lbs.).
13. Reinstall axle shafts.

14. Reinstall "C"-lock, pinion shaft and screw. Torque screw to 34 N-m (25 ft.lbs.).

15. Reinstall differential cover with new gasket. Tighten bolts in a crosswise pattern to assure uniform draw on the gasket. Torque bolts to 27 N-m (20 ft.lbs.). Reclip brake line to the axle.

16. Refill differential with SAE-80W or SAE-80W-90GLS gear lubricant, P/N 1051855. It will hold approximately 4 pints. Torque filler plug to 34 N-m (25 ft.lbs.).
17. Install new brake drums.

18. Connect parking brake cables at equalizer and adjust.

19. Reinstall tires. Torque wheel stud nuts to 140 N-m (100 ft.lbs.).

20. Bleed brake system. Refer to Section 5 of the applicable Light Duty Service Manual for instructions. Use Delco Supreme II fluid, P/N 1052535 or DOT-3 equivalent.

21. Install Campaign Identification Label.

CAMPAIGN IDENTIFICATION LABEL:

CAMPAIGN IDENTIFICATION LABEL

Each vehicle corrected in accordance with the instructions outlined in this Product Campaign Bulletin will require a "Campaign Identification Label". Each label provides a space to include the five digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or ballpoint pen.
Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought in for periodic servicing by the owner.

Apply "Campaign Identification Label" only on a clean dry surface.