Locking Differential - GMC 1989 Light Duty Truck Repair Manual

LOCKING DIFFERENTIAL

S U B J E C T
Locking D ifferentials.................................................................................................................................................................. 4 B 7 - 1
71 / 2 , 7 5 /s, 8 V 2 and 91 / 2 -lnch Ring G e a r............................................................................................................................. 4B 7- 1
101 2
/ -lnch Ring G e a r ............................................................................................................................................................. 4B 7- 5
S p e c ific a tio n s ............................................................................................................................................................................. 4 B 7 - 9
Special T o o ls ................................................................................................................................................................................4B 7-10
7 1/2, 75/ , 8 1/2 AND 91/2-INCH
s
RING GEAR
DISASSEMBLY OF THE DIFFERENTIAL
Rem ove or D isconnect (Figure 1)
Tools Required:
J 26252 Governor Remover
1. Governor bushing (4) using J 26252 (figure 2).
2. The C-clips that hold the latching bracket in place
on the bracket shaft.
• Move the bracket down the shaft.
3. Latching bracket bushing (5) using J 26252.
4. Latching bracket (11), shaft, and spring from the
case.
5. Governor assembly (11) from the case.
6. Stop pin (2). (91 /2-inch only.)
7. Lockscrew (3).
8. Pinion shaft (18).
9. D iffe re ntia l pinion gears (7) and pinion th ru s t
washers (6).
• Roll the gears out of the case by rotating one
of the side gears.
10. Thrust block (17).
11. Right side gear (10).
12. Right disc pack (9) and side thrust washer.
13. Left side gear (21), cam plate (16), and disc pack
(12) as an assembly (cam unit).
14. Side gear thrust washer (13).
CAM UNIT DISASSEMBLY - 7 1/2 AND
0
R em ove or D isconnect (Figures 1 and 3)
1. Snap ring (22).
2. Clutch plates.
3. Guide clips (20).
4. Wave spring.
5. Cam plate (16).
6. Cam side gear (21).
SECTION 4B7
CONTENTS
LOCKING DIFFERENTIALS
8 2
V -INCH
CAM UNIT DISASSEMBLY - 9 1 /2-INCH
4
- *
R em ove or D isconnect
Tools Required:
J 22912-01 Bearing Remover
• Measure and record the overall length of the gear
assembly from the front of the gear to the back of
the thrust sleeve (14) including the side gear washer
(13).
1. Guide clips (20).
2. Thrust sleeve (14) using J 22910-01.
• Press the sleeve from the side gear (figure 4).
3. Lock plates.
4. Wave spring.
5. Cam plate (16).
6. Cam side gear (21).
CLEANING AND INSPECTION
131
Clean
All parts with solvent.
Inspect
U
• All parts for excessive wear and breakage. '
• Pinion gear and side gear teeth for wear, cracks,
scorring, and spalling.
• Thrust washer for wear.
• The fit of the side gears on the axle shafts.
• Differential case for cracks and scorring.
• Thrust sleeve for excessive wear. Do not replace the
thrust sleeve unless necessary. Inspect the side
gear bore for scorring. If scorring is present, replace
the entire differential.
• Replace parts as necessary.
4B7-1
P A G E