R Eassem Bly - GMC 1982 Light Duty Truck Service Manual

4B6-16 REAR AXLE
Fig. 4B6-6H-Bearing Remover J-22912
reassembly unit if thrust ring is replaced. DO NOT
REPLACE TH RUST RING U N LESS NECESSARY.
If ring is excessively worn or scored, check bore in case
for scoring. If bore is scored, replace entire differential.
2. With gear hub end up, compress disc pack and install
jaws of split ring bearing remover (J-22912) between
the thrust ring and the top eared disc. Bevel side of
bearing remover should face up toward thrust ring.
3. Place cam gear assem bly with bearing remover
attached in an arbor press supporting the bearing
remover on both sides.
4. Install a 1-1/2" to 1-3/4" diameter plug similar to (J-
8107-4) on gear hub. Press against plug with ram of
press to remove thrust ring. Keep all components in the
proper order, Figure 4B6-6H .
R e a sse m b ly
Replace cam plate and wave spring or clutch discs as
necessary and reassemble as follows: See Fig. 4B6-1H.
1. Place gear on bench with hub end up.
2. Assemble cam plate with cam form down to mate with
cam form on gear.
3. Assemble onto cam plate: (2) eared discs, (1) splined
disc, and (1) wave spring alternaely as shown.
4. Assemble on to gear hub (3) splined discs and (3) eared
discs alternately as shown. Begin with a splined disc
and end with an eared disc.
5. Locate cam gear assembly in arbor press with hub end
up. Place thrust ring on gear hub and press to shoulder
making sure that ring is square with hub.
a. Compress disc pack by pushing down on the discs to
keep the splined discs from becoming wedged
between the thrust ring and gear shoulder while
pressing the sub-assembly together. Completed sub-
assembly should be checked for proper disc sequence.
Also, make sure the first splined disc (large spline) is
properly located on the cam plate.
R e a sse m b ly
1. Install (4) clutch pack guide clips on the ears of the
cam gear clutch pack using grease for retention.
2. Install cam gear assembly and original shim in flange
end of case. If a new thrust ring has been pressed on the
cam gear, reshimming may be necessary. Measure the
overall length of the new cam gear assembly, including
the shim and compare to the dimension obtained in
Step A of cam gear service section. If the length of the
new assembly varies by more than .003" larger or
smaller than the original dimension, reshimming will
be necessary. Select a shim which will result in a
reading closest to the original.
Incorrect shimming will disturb critical
N O T IC E :
clearance dimensions and may result in differential
failure.
3. Lock an axle shaft in vise, in a vertical position. Mount
the differential case over the end of the axle shaft
engaging the spline of the side gear with the shaft.
Grease the two pinion gear thrust washers and locate
them in their proper position. Install the opposite end
side gear and original shim. Original shim must be used
to maintain proper clearance dimensions.
4. Insert one pinion gear through the small window
opening in the case while at the same time inserting the
reaction block and other pinion gear through the large
window opening. Rotate the two pinion gears and
thrust block 90° so as to position the reaction block with
the open side towards the small window opening in the
case. Be sure the two pinion gears and thrust washers
are in their proper location.
Reaction block must be replaced with a block
N O T IC E :
of the identical thickness. Incorrect block thickness will
disturb critical clearance dimensions and may result in
differential failure.
5. Install shaft and lock screw.
6. Insert governor assembly and latching bracket into
case, Figure 4B6-4H. Place straight end of latching
bracket spring over and to the outside of the
engagem ent shaft to preload the latching bracket
against the governor assembly. Press bushing and 1/4"
stop pin into case. Press bushing for governor assembly
into case to give .004 to .020 shaft end play. Press
bushing for latching bracket into case to remove end
play. A 3/8 diameter plug or socket will aid in pressing
the bushings into the housing. Press stop pin flush with
top of case.
For the latching bracket use bushing with the tapered
hole. The bushing for the governor assembly has a
straight hole.