GMC 1989 Light Duty Truck Repair Manual page 167

Figure 9— Installing the Front Pinion Bearing Cup
• If the rear axle was operated for an extended period
of time with very loose bearings, the ring gear and
drive pinion will also require replacement.
• Low mileage bearings may have minute scratches
and pits on the rollers and the bearing cups from the
initial preload. Do not replace a bearing for this
reason.
• Bearing caps for cracks or chips.
SHIMS
Inspect
L *
• Shims for cracks and chips. Damaged shims should
be replaced with an equally sized service shim.
ASSEMBLY OF THE REAR AXLE
|+<-| Install or C onnect (Figures 9 and 10)
Tools Required:
J 7817 Front Pinion Bearing Cup Installer
J 22306 Rear Pinion Bearing Cup Installer
1
9 /2-INCH RING GEAR 4B3-5
Figure 11— Gage Plate Tools
J 8092 Driver Handle
1. Front pinion bearing cup (10) using J 7817 and
J 8092.
2. Rear pinion bearing cup (13) using J 22306 and
J 8092.
PINION DEPTH ADJUSTMENT
Tools Required:
J 8001 Dial Indicator Gage Set
J 21777-1 Arbor
J 21777-8 Rear Pilot Washer
J 21777-42 Front Pilot Washer
J 21777-43 Stud Assembly — Bolt
J 21777-85 Gage Plate
J 21777-86 Side Bearing Disc
1 Clean all the gage parts.
.
2
Lubricate the front and rear pinion bearings with
.
axle lubricant.
3. Place the bearings (10) and (13) into the pinion
bearing cups.
4. In s ta ll J 21777-8, J 21777-42, J 21777-85 and
J 21777-43 to the pinion bore (figure 11).
5. Hold the stud stationary at the flats of the stud.
Tighten
• Stud nut to 2.2 N m (20 in. lbs.).
6 . R otate the g ag e p la te and b e a rin g s se veral
complete revolutions to seat the bearings.
7. Tighten the stud nut until a torque of 1.6 to 2.2 N m
(15 to 25 in. lbs.) is obtained to keep the gage plate
in rotation.
8
. Assemble J 21777-86, J 21777-1 Arbor, and J 8001 to
the differential bearing bore as shown in figure
• The bearing bores must be clean and burr
free.
9. Install the side bearing caps, and tighten the bolts
finger tight.
10. Rotate the gage plate until the proper gaging area is
parallel with the disks.
11. Position the gage shaft assembly in the carrier so
that the dial indicator rod is centered on the gaging
area of the gage block.
12 .