GMC 1990 Light Truck Repair Manual page 205

BEARINGS
I P Inspect
Bearings visually and by feel.
The bearings should feel smooth when oiled and
rotated while applying as much hand pressure as
possible.
The large end of the bearing rollers for wear. This is
where tapered roller bearing wear is most evident.
Bearing cups for wear, cracks, brinelling and
scoring.
Bearings and cups are only replaced as sets.
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
DIFFERENTIAL CASE ASSEMBLY
-► < " Install or Connect (Figure 42)
Tools Required:
D-136 Master Differential Bearings (Miller) H.D.
D-117 Master Differential Bearings (Miller)
• Lubricate all parts with rear axle lubricant.
1. New side gear thrust washers (27) to the side gears
(25).
2
. Side gears (25) to the differential case.
• Place the side gears in place on the same side
as removed (figure 58).
DANA REAR AXLES 4B5-19
Figure 59—Installing the Lock Pin
3. Pinion gears (24) to the differential without the thrust
washers (26).
• Place the pinion gears onto the side gears so
that the holes in the pinion gears are 180
degrees apart.
• Rotate the pinion gears into place, and verify
that the pinion gears line up with the pinion
shaft holes.
4. New pinion thrust washers (26).
• Rotate the pinion gears toward the differential
opening just enough to slide in the pinion
thrust washers.
5. Pinion shaft (28).
• Aliqn the lock pin holes in the case and the
shaft.
6
. Lock pin (29) (figure 59).
• Peen metal from the case over the lock pin.
• Check that the mating surfaces of the differential
case and the ring gear are clean and burr free.
7. Ring gear (2) to the differential case (22).
• Thread two studs into the ring gear on
opposite sides.
• Press the ring gear onto the case, and align
the holes in the case with the studs.
8
. New ring gear bolts (23) (figure 60).
• Tighten the ring gear bolts alternately in
stages gradually pulling the ring gear onto the
differential case.
Tighten
• The new ring gear bolts in sequence to 149
N m (110 ft. lbs.). Refer to " Specifications" for
bolt information.
9. Master differential bearings D-117 (Miller Tools) to
the differential (figure 61). D-136 (Miller) for H.D.
Axles.
• Refer to " Determining Total Shim Pack Size" in this
section.