Shims; Assembly Of The Rear Axle; Pinion Depth Adjustment - GMC T Series 1994 Repair Manual

SHIMS

Inspect
• Shim s for cracks and chips. Dam aged shims
should be replaced with an equal size service
shim.

ASSEMBLY OF THE REAR AXLE

■H- Install or Connect (Figures 1 and 10 through
14)
Tools Required:
J 8608 Rear Pinion Bearing Cup Installer
J 8611-01 Front Pinion Bearing Cup Installer
J 8092 Driver Handle
1. Front pinion bearing cup (39) using J 8611-01 and
J 8092 (figure 10) .
2. Rear pinion bearing cup (5) using J 8608 and
J 8092 (figure 11).

PINION DEPTH ADJUSTMENT

Tools Required:
J 8001 Dial Indicator Gage Set
J 21777-1 Arbor
J 21777-29 Gage Plate
J 21777-35 Rear Pilot Washer
J 21777-42 Front Pilot Washer
J 21777-43 Stud Assembly— Bolt
J 21777-45 Side Bearing Disc
1. Clean all the gauge parts.
2. Lubricate the front and rear pinion bearings with
axle lubricant.
3. Place the bearings into the pinion bearing cups.
4. Install J 21777-35, J 21777-42, J 21777-29, and
J 21777-43 to the pinion bore (figure 12).
NOTICE: Hold the stud stationary at the flats
of the stud.
Tighten
• Stud nut to 2.2 N-m (20 lbs. in.).
5. Rotate the gauge plate and bearings several com­
plete revolutions to seat the bearings.
6. Tighten the stud nut until a torque of 1.6 to 2.2 N-m
(15 to 25 lbs. in.) is obtained to keep the gauge
plate in rotation.
7. Assemble J 21777-45, J 21777-1, and J 8001 to
the differential bearing bore as shown in figure 13.
• The bearing bores must be clean and burr free.
8. Install the side bearing caps and tighten the bolts
finger tight.
9. Rotate the gage plate until the proper gauging area
is parallel with the discs.
10. Position the gage shaft assembly in the carrier so
the dial indicator rod is centered on the gauge area
of the gauge block.
11. Set the dial indicator at zero. Push the indicator
down on the indicator shaft until the needle rotates
approximately 3/4 of a turn to the right. Tighten the
dial indicator in this position.
12. Rotate the gauge shaft slowly back and forth until
the dial indicator reads the greatest deflection. This
is when the indicator needle is centered between
movement to the left and to the right.