Chevrolet 1988 Light Duty Truck Repair Manual page 193

SUBJECT
93/4-lnch Ring G e a r .......................................................................................................................................... L ........................... 4 B 5 - 1
D e s c rip tio n ......................................................................................................................................................L........................... 4 B 5 - 1
Checking the Axle Before D isassem bly................................................................................................ [ ........................... 4 B 5 - 1
Diassembly of the Rear A x le ..................................................................................................................... j............................ 4 B 5 - 2
C le a n in g .........................................................................................................................................................................................4 B 5 - 2
In s p e ctio n ........................................................................................................................................................ ............................. 4 B 5 - 2
Assembly of the Rear A x le ......................................................................................................................................................4 B 5 - 7
10 1 /2-lnch Ring G e a r ...................................................................................................................................................................... 4 B 5 -1 3
D e scrip tio n .................................................................................................................................................................................... 4 B 5 -1 3
Checking the Axle Before D isassem bly................................................................................................
Disassembly of the Rear A x le .................................................................................................................................................4 B 5 -1 5
C le a n in g .........................................................................................................................................................................................4 B 5 -1 8
In sp ection ........................................................................................................................................................
Assembly of the Rear A x le ......................................................................................................................................................4 B 5 -1 9
S p e c ific a tio n s ..................................................................................................................................................................................4 B 5 -2 7
Special T o o ls .................................................................................................................................................................................... 4 B 5 -2 8
DESCRIPTION
T he D ana 9 3/4 -in ch rin g g e a r re a r a xle uses a
conventional ring and pinion gear set to transm it the
driving force of the engine to the rear wheels. This gear
set transfers this driving force at a 90 degree angle from
the propeller shaft to the drive shafts.
This axle is full-floating. The axle shaft is supported 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 differential.
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 the rear axle housing.
The pinion bearing preload is set by a shim pack at the
front of the axle housing between the bearing cone and
the pinion gear.
The ring gear is bolted onto the differential case with
right-hand thread bolts.
The differential case is supported in the case by two
tapered roller bearings. The differential and ring gear are
located in relationship to the pinion by using selective
shims between the bearings and the differential case. To
move the ring gear, shims are deleted from one side and
an equal am ount are added to the other side. Differential
side bearing preload is set by the axle housing. (The axle
housing is spread to remove the differential from the
housing). When the spreader is removed, the housing
sets the bearing preload.
SECTION 4B5
DANA REAR AXLES
CONTENTS
93/4-INCH RING GEAR
Two bearing caps are used to hold the differential into
the rear axle housing.
The differential is used to allow the w heels to turn at
different rates of speed while the rear axle continues to
transm it the driving force. This prevents tire scuffing when
going around corners and prevents prem ature wear on
internal axle parts.
The rear axle is sealed with a pinion seal, a hub seal,
and RTV between the differential cover and the rear axle
housing.
All Dana axles are identified by the part num ber on the
right axle tube next to the m anufacturing date w hich is
next to the carrier. The model num ber is cast on the ear of
the carrier. The carrier cover does not have a drain plug.
CHECK THE AXLE
BEFORE DISASSEMBLY
Inspect
Remove the axle cover from the rear axle and drain
the axle lubricant into a suitable container.
T he rin g g e a r b a c k la s h . R e fe r to " B a ckla sh
A djustm ent" in this section. This inform ation can be
used to determ ine the cause of the axle problem. It
will also help when setting up the shim packs for
locating and preloading the differential case.
The case for metal chips and shavings. Determ ine
where these chips and shavings come from, such as
a broken gear or bearing cage.
4B5-1
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