GMC 1989 Light Duty Truck Repair Manual page 143

• Production shims are cast iron and are not to be
reused. Measure the production shims and spacers
one at a time, and add the measurements together
to obtain the sizes of the left and right shim packs.
• Service spacers are 4.32 to 4.37 mm (0.170 to
0.172-inch) thick.
• Service shims are available from 1.02 mm to 2.54
mm (0.040 to 0.100-inch) in increments of 0.101 mm
(0.004-inch).
• Be sure that the side bearing surfaces are clean and
free of burrs.
Figure 11 — A ligning th e Ring G ear Studs
71/2 AND 7 /8-INCH RING GEAR AXLES 4B1-7
s
Figure 10— Checking Pinion Depth
1. Place the case with the bearing cups installed into
the axle housing (figure
2. Insert the service spacer between the bearing cup
and the axle housing. Place the chamfered edge
against the housing.
3. Install the left bearing cap and bearing cap bolts. Do
not tighten the bolts.
4. Select one or two shims totaling the amount needed
as shown in figure 13.
1
).
• L u b ric a te th e a x le b e a rin g s w ith
lubricant.
F igure 12— Installing th e S ide B earing
a x le
J-8 0 9 2
J -2 5 2 9 9
F-04684