GMC T Series 1994 Repair Manual page 175

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......................................................................................................................................................4B5- 1
Checking the Axle Before Disassem bly............................................................................................................. 4B5- 2
Disassembly of the Rear A xle ...............................................................................................................................4B5- 2
C lean in g ....................................................................................................................................................................... 4B5- 6
Inspection.................................................................................................................................................................... 4B5- 6
Axle H ousing.......................................................................................................................................................... 4B5- 6
Differential................................................................................................................................................................4B5- 6
Pinion and Ring Gear.......................................................................................................................................... 4B5- 6
B earin g s...................................................................................................................................................................4B5- 7
S h im s........................................................................................................................................................................ 4B5- 7
Assembly of the Rear A xle.................................................................................................................................... 4B5- 7
Differential Case A ssem bly................................................................................................................................4B5- 7
Determining Total Shim Pack S ize .................................................................................................................. 4B5- 8
Pinion Depth Adjustm ent.................................................................................................................................... 4B5- 8
Pinion Installation................................................................................................................................................. 4B5- 9
Assembling the Differential into the Axle H o u sin g ................................................................................... 4B5-11
Checking B acklash............................................................................................................................................... 4B5-11
Gear Tooth Pattern Check...................................................................................................................................... 4B5-12
Adjustments Affecting Tooth C o n tact................................................................................................................ 4B5-12
Final Assem bly.......................................................................................................................................................4B5-12
Specifications................................................................................................................. ............................................... 4B5-14
Fastener Tightening Specifications......................................................................................................................4B5-14
Ring Gear B o lts.........................................................................................................................................................4B5-14
Available Shim Sizes................................................................................................................................................ 4B5-14
Pinion Bearing and Differential Bearing Preload Specification.................................................................. 4B5-14
Lubrication...................................................................................................................................................................4B5-14
Special T o o ls..................................................................................................................................................................4B5-15
The Dana 11-inch ring gear rear axle uses a conven­
tional ring and pinion gear set to transmit the driving
force of the engine to the rear wheels. The gear set
transfers the driving force at a 90 degree angle from the
propeller shaft to the axle shafts.
This axle is full-floating. The axle shafts are support­
ed at the wheel ends by the wheel hubs. The bolts that
attach the shaft to the hub support the axle at the hub.
The splined end of the shaft is supported by the differ­
ential.
SECTION 4B5
DANA MODEL 80
(11-INCH RING GEAR)
CONTENTS
GENERAL DESCRIPTION
The pinion gear is supported by two tapered roller
bearings. The pinion depth is set by a shim pack
between the inner pinion bearing cup and axle housing.
The pinion bearing preload is set by a shim pack at the
front of the axle housing between the bearing cone and
pinion gear.
The ring gear bolts to the differential case.
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
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