GMC T Series 1994 Repair Manual page 147

9 1/2-INCH RING GEAR
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
General Description......................................................................................................................................................4B3- 1
Checking the Axle Before Disassem bly............................................................................................................. 4B3- 2
Disassembly of the Rear A xle...............................................................................................................................4B3- 2
C leaning....................................................................................................................................................................... 4B3- 5
Inspection................................................................................................................................................ ................... 4B3- 5
Axle H ou sing .......................................................................................................................................................... 4B3- 5
Differential................................................................................................................................................................4B3- 5
Pinion and Ring G ear...........................................................................................................................................4B3- 5
B earin g s................................................................................................................................................................... 4B3- 5
Shim s........................................................................................................................................................................ 4B3- 6
Assembly of the Rear A xle.................................................................................................................................... 4B3- 6
Pinion Depth Adjustm ent.................................................................................................................................... 4B3- 6
Pinion Installation................................................................................................................................................. 4B3- 8
Differential Case A ssem bly................................................................................................................................4B3- 9
Side Bearing Preload A djustm ent................................................................................................................... 4B3-10
Backlash Adjustm ent............................................................................................................................................4B3-10
Final Assem bly.......................................................................................................................................................4B3-11
Gear Tooth Pattern C heck...................................................................................................................................... 4B3-11
Adjustments Affecting Tooth Contact................................................................................................................. 4B3-12
S p ecifications.................................................................................................................................................................4B3-14
Fastener Tightening Specifications......................................................................................................................4B3-14
Spacer and Shim Specifications.......................................................................................................................... 4B3-14
Lubrication................................................................................................................................................................... 4B3-14
Special T o o ls ..................................................................................................................................................................4B3-15
The corporate 9 1/2-inch ring gear rear axle uses a
conventional ring and pinion gear set to transmit the
driving force of the engine to the rear wheels. The gear
set transfers this driving force at a 90-degree angle
from the propeller shaft to the axle shafts.
This axle is semi-floating. The axle shafts are sup­
ported at the wheel end of the shaft by roller bearings
pressed into the housing. The shafts are retained into
the housing by retaining clips in the differential. The
pinion gear is supported by two tapered roller bearings.
The pinion depth is set by a shim pack located
between the pinion gear end and roller bearing. The
pinion bearing preload is set by crushing a collapsible
SECTION 4B3
CONTENTS
GENERAL DESCRIPTION
spacer between the bearings in the axle housing.
The ring gear bolts to the differential case with
left-hand thread bolts.
The differential case is supported by two tapered roll­
er bearings. The differential and ring gears are located
in relationship to the pinion using selective shims
between the bearing and axle housing. To move the
ring gear, remove shims from one side and add an
equal amount added to the other side. The differential
bearing preload is set by a threaded differential bearing
adjusting nut located between the axle housing and dif­
ferential bearing cap. Two bearing caps hold the differ­
ential in the axle housing.
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