GMC 1989 Light Duty Truck Repair Manual page 157

• Service shims are available from 0.040 to
• Be sure that the side bearing surfaces are clean and
free of burrs.
Tool Required:
J 22779 Side Bearing Backlash Gage
1. Place the differential case and the bearing cups into
the axle housing.
• L u b ric a te th e a x le b e a rin g s w ith a x le
lubricant.
• Support the case to keep it from falling into the
axle housing.
2. Install the strap from J 22779 on the left bearing with
the cap bolts. Tighten the bolts snugly.
3. Push the ring gear towards the pinion.
• Engage the ring gear with the pinion tightly, to
a backlash of 0.000
4. Insert J 22779 between the axle housing and the left
bearing cup (figure 20 ).
5. Move the tool back and forth in the bore while
tu rn in g the a d ju s tin g nut to the rig h t u ntil a
noticeable drag is produced (figure
• Tighten the lock bolt on the side of the tool.
Figure 2 0 — Installing Side B earing Gaging Tool
0 100
. -inch.
to 0 . 001 -inch.
21
).
F-04708
8 2
V -INCH RING GEAR 4B2-9
Figure 21— Measuring Side Bearing Shim
Requirements
• Leave the tool in place.
6 . Install a service spacer (9) and a service shim (9)
between the right bearing cup and the axle housing.
7. D e te rm in e b e a rin g
progressively larger feeler gage sizes between the
carrier and the service shim.
• Push the feeler gage downward so that it
contacts the shim at the top and bottom, and
then contacts the axle housing.
• The point just before additional drag begins is
the correct feeler gage thickness. This is the
zero setting without preload.
8
. Remove the strap, J 22779, the service spacer,
service shim, feeler gage, and differential case from
the axle housing.
9. M e a s u re J 22779 in th re e
micrometer. Average the readings (figure 22).
10. Add the dimensions of the right side service spacer,
service shim, and the feeler gage.
Figure 2 2 — M easuring th e Gage P late Thickness
p re lo a d by in s e rtin g
p la c e s u s in g a