GMC 1990 Light Truck Repair Manual page 153

A. Dial indicator and arbor positioned on the gage block.
B. Measurement after the arbor is moved off of the gage block. ^ A
Tighten
The nut until the pinion end play is just taken
up. Rotate the pinion while tightening the nut
to seat the bearings. Once there is no end play
in the pinion, the preload torque should be
rechecked.
Remove J 8614-01. Using an inch-pound
torque wrench, check the pinion preload by
rotating the pinion with the wrench. Preload
should be at or below 2.3 to 2.8 N-m (20 to 25
in. lbs.) on new bearings, or 1.1 to 1.7 N-m (10
to 15 in. lbs.) for used bearings (figure 16).
If the preload torque is below the preloads
given above, continue torquing the nut in small
increments. Check the preload after each
A. Pinion Oil Seal
Figure 14—Installing the Pinion Oil Seal
Figure 13—Checking Pinion Depth
8. Differential case. Refer to " Backlash Adjustment" in
this section.
F-04702
8 2
V -INCH RING GEAR 4B2-7
.
tightening. Each tightening increases the
bearing preload by several pounds. If the
bearing preload is exceeded, the pinion will
have to be removed, and a new collapsible
spacer installed.
• Once the preload has been obtained, rotate
the pinion several times to assure that the
bearings have seated. Recheck the preload,
and adjust if necessary.
Figure 15—Installing the Pinion Flange
F-04682
F-04694