Chevrolet 1991 Light Duty Truck Repair Manual page 205

LOCKING DIFFERENTIAL
NOTICE: When fasteners are removed, always reinstall them at the same location from which they were
removed. If a fastener needs to be replaced, use the correct part number fastener for that application. If
the correct part number fastener is not available, a fastener of equal size and strength (or stronger) may be
used. Fasteners that are not reused, and those requiring thread locking compound will be called out. The
correct torque value must be used when installing fasteners that require it. If the above conditions are not
followed, parts or system damage could result.
SUBJECT
Locking D iffe re n tia ls .................................................................................................................................................4B7- 1
71/2, 7 5/8, 8 1/2 and 9 1/2-Inch Ring G e a r.................................................................................................. 4B7- 1
101/2-Inch Ring G ear............................................................................................................................................ 4B7- 5
S pecifica tio ns ........................................................................................................................................................... 4B7- 9
S pecial T o o ls.............................................................................................................................................................. 4B7-10
7 1/2, 7 5/8, 8 1/2 AND
9 1/2-INCH RING GEAR
DISASSEMBLY OF THE DIFFERENTIAL
0 Remove or Disconnect (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). (9 1/2-inch only.)
7. Lockscrew (3).
8. Pinion shaft (18).
9. Differential pinion gears (7) and pinion thrust wash­
ers (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).
SECTION 4B7
CONTENTS
LOCKING DIFFERENTIALS
LOCKING DIFFERENTIAL 4B7-1
CAM UNIT DISASSEMBLY
7 1/2, 7 5/8 AND 8 1/2-INCH
+ + Install o r Connect (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).
CAM UNIT DISASSEMBLY — 9 1/2-INCH
0
Remove or Disconnect
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 wash­
er (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).
PAGE