GMC T Series 1994 Repair Manual page 191

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 m ust be used when installing fasteners that require it. If the above conditions
are not followed, parts or system damage could result.
SUBJECT
Locking Differentials.....................................................................................................................................................4B7- 1
71/2, 7 5/8, 8 1/2 and 9 1/2-Inch Ring G ear...................................................................................................... 4B7- 1
Disassembly of the Differential......................................................................................................................... 4B7- 1
Cam Unit Disassembly - 7 1/2, 7 5/8, and 8 1/2-Inch................................................................................ 4B7- 2
Cam Unit Disassembly - 9 1/2-Inch................................................................................................................. 4B7- 2
Cleaning and Inspection..................................................................................................................................... 4B7- 3
Cam Unit Assembly - 7 1/2 and 8 1/2-Inch................................................................................................... 4B7- 4
Cam Unit Assembly - 9 1/2-Inch....................................................................................................................... 4B7- 4
Adjustment of the Differential........................................................................................................................... 4B7- 4
Assembly of the Differential...............................................................................................................................4B7- 5
101/2-Inch Ring G ear................................................................................................................................................ 4B7- 5
Disassembly of the Differential......................................................................................................................... 4B7- 5
Cleaning and Inspection..................................................................................................................................... 4B7- 7
Cam Unit A ssem bly.............................................................................................................................................. 4B7- 7
Adjustment of the Differential........................................................................................................................... 4B7- 7
Assembly of the Differential...............................................................................................................................4B7- 9
S pecification s.................................................................................................................................................................4B7-10
Fastener Tightening Specifications......................................................................................................................4B7-10
Thrust Block S iz e s ....................................................................................................................................................4B7-10
Reaction Block Size - 10 1/2-Inch........................................................................................................................ 4B7-10
Right Side Gear Thrust W a sh e r........................................................................................................................... 4B7-10
Reaction Block Thrust W ashers........................................................................................................................... 4B7-10
Lubrication................................................................................................................................................................... 4B7-10
Special T o o ls ..................................................................................................................................................................4B7-11
7 1/2, 7 5/8, 8 1/2, AND
9 1/2-INCH RING GEAR
DISASSEMBLY OF THE DIFFERENTIAL
Remove or Disconnect (Figures 1 through 7)
Tools Required:
J 26252 Governor Remover
1. Governor bushing (4) using J 26252 (figure 2).
2. The E-clips that hold the latching bracket in place
on the bracket shaft.
SECTION 4B7
CONTENTS
LOCKING DIFFERENTIALS
3. Latching bracket bushing (5) using J 26252.
4. Latching bracket (5), shaft, and spring from the
case.
5. Governor assembly (11) from the case.
6. Stop pin (2) (9 1/2-inch only).
7. Lock screw (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 clutch plates (9) and side thrust washer.
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