Pinion Installation; Shim Thickness Chart; Installing The Pinion Inner Bearing - Chevrolet 1991 Light Duty Truck Repair Manual

. Place the case with the bearing cups installed into
1
the axle housing (figure
• Lubricate the axle bearings with axle lubricant.
• Support the case to keep it from falling into the
axle housing.
2 Insert J 22779 between the axle housing and the
left bearing cup (figure 18).
a Move the tool back and forth in the bore while
turning the adjusting nut to the right until a notice­
able drag is produced (figure 19).
• Tighten the lock bolt on the side of the tool.
• Leave the tool in place.
4. Install a service spacer (9) and a service shim (9)
between the right bearing cup and the axle hous­
ing.
5. Determine bearing preload by inserting progres­
sively larger feeler gage sizes between the carrier
and the service shim.
• Push the feeler gage downward so that it con­
tacts 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.
. Remove the strap, J 22779, the service spacer,
6
service shim, feeler gage, and differential case
from the axle housing.
7. Measure J 22779 in three places using a microme­
ter Average the readings (figure 20).
. Add the dimensions of the right side service spac­
8
er, service shim, and the feeler gage.
9. For an initial backlash setting, move the ring gear
away from the pinion by subtracting
from the ring gear side shim pack and adding
. -inch to the shim pack on the opposite side.
0 010
10. To obtain the proper preload on the side bearings
add 0.10mm (0.004-inch) to the measurement of
each shim pack.
11. Install the differential. Refer to "Backlash Adjust­
ment" in this section.
Requirements
7 1/2 AND 7 5/8-INCH RING GEAR A XLES 4B1-9
).
2
. -inch
0 0 1 0
Figure 21—Shim Thickness Chart

PINION INSTALLATION

Install or Connect
Tools Required:
J 5590 Rear Pinion Bearing Cone Installer
J 23911 Pinion Oil Seal Installer
J 8614-01 Pinion Flange Holder
• The bearing cups should have been installed in
" Pinion Depth Adjustment," in this section.
1. The pinion inner bearing (18) using J 5590 (figure
22).
• Drive the bearing until the bearing cone seats
on the pinion shims.
2. A new collapsible spacer (17).
• Lubricate the pinion bearings with axle lubricant.
3. Pinion (20) to the axle housing.
4. Outer pinion bearing (15) onto the pinion using
J 5590.
• Hold the pinion forward from inside the case
while driving the bearing onto the pinion.
yfi
---------
1 8
20---------
18. Pinion Rear Bearing
20. Pinion
Figure 22—Installing the Pinion Inner Bearing
-------- J-5590
F4686