GMC 1982 Light Duty Truck Service Manual page 486

4B6-4 REAR AXLE
Fig. 4B6-10--Spring Pack Compressed for Installation
assembly in vise. Install "C" clamp and bar stock on
spring retainer then install a 1/4 inch bolt and nut in
each front spring. See figure 4 B 6 -10.
16. Position spring pack between side gears and remove bar
stock and "C" clamp.
17. Drive spring pack into side gears sufficiently to retain
front springs, then remove 1 /4 inch bolts from springs.
Drive spring pack into position. See figure 4B6-12.
18. Install the pinion shaft and lock screw to retain side
gears until axle shafts are installed.
19. Check alignment of spring retainer with side gears.
Slight movement of the spring pack can be made if
necessary.
20. Install side bearings and ring gear to case using
procedure outlined for the conventional differential.
21. Place differential in carrier and adjust bearings and
backlash as outlined for the conventional differential.
22. Check operation of unit as follows:
a. Raise rear of vehicle until rear wheels are off the
ground, and remove one wheel and tire assembly.
b. Attach Adapter J-5748 to axle shaft flange and
install a 1/2-13 bolt into adapter, shown in figure
4B6-13.
Fig. 4B 6 -1 1--Installing Spring Pack Compression Tool
Fig. 4B6-12—Installing Spring Pack
c. With wheel and tire assembly still on vehicle held
firmly to prevent turning, measure torque required to
rotate opposite axle shaft with a 0-150 lb. torque
wrench attached to J-5748 Torque required to rotate
axle shaft should be no less than 54 N-m (40 ft. lbs.).
Fig. 4B6-13--Measuring Positraction Rotating Torque