GMC 1990 Light Truck Repair Manual page 224

4B6-8 12-INCH RING GEAR (ROCKWELL)
Figure 20—Differential Components
3. Cage bolts (56).
Tighten
• Bolts to 48 N-m (35 ft. lbs.).
DIFFERENTIAL CASE ASSEMBLY
+4-
Install or Connect
• Lubricate all parts with rear axle lubricant.
1. Differential pinion gears (41) and thrust washers (42)
to the spider (40) (figure 21).
2. Differential side gears (43) and thrust washers (38)
to the differential case halves in their original
locations.
3. Differential spider (40) to the differential.
4. The case halves (figure 22).
• Align the scribe marks on the case halves.
5. Case bolts (44).
Figure 22—Installing the Case Halves
Tighten
• Bolts (44) to 61 N-m (45 ft. lbs).
• Check that the mating surfaces of the differential
case and the ring gear are clean and burr free.
• The ring gear must be heated before assembly to
the differential case. Heat the ring gear in water to
160° — 180° F for 10 minutes before assembly.
6
. Ring gear to the differential.
(37)
• Thread two studs into the ring gear on
opposite sides.
• Place the ring gear onto the case, and align
the holes in the c ase with the studs.
New ring gear bolts (44).
7.
• Tighten the ring gear bolts alternately in
stages gradually pulling the ring gear onto the
differential case.
Tighten
&
• The ring gear bolts in sequence to 136 N-m
(100
ft. lbs.).
Differential side bearings (33).
Figure 24—Installing the Bearing Cup