GMC 1982 Light Duty Truck Service Manual page 416

4 B -2 REAR AXLE
1 . C o m p a n io n F la n g e
2 . D e fle c t o r
3 . P in io n O i l S e a l
4 . P in io n F ro n t B e a rin g
5 . P in io n B e a rin g S p a c e r
6 . D if f e r e n t i a l C a r r i e r
DANA 9 -3 /4 " RING G EA R AXLE
The D ana axle shown in figure 4B-5 is similar to the
unit shown in 4B-4; however, the differential side bearing
shims are located between the case and the side bearings.
ROCKWELL 12" RING G EA R AXLE
T he 11,000 lb. capacity, single-speed hypoid axle,
illustrated in figure 4B-5a, has a straddle mounted drive
pinion which is supported at the rear by a straight roller
bearing. The pinion front bearing consists of a double row
ball bearing.
T he differential is a conventional four-pinion type.
Thrust washers are used between the side gears and case and
also between differential pinions and the differential case.
7 . D if f e r e n t i a l C a s e
8 . S him
9 . G a s k e t
1 0 . D if f e r e n t i a l B e a rin g
1 1 . " C " L ock
1 2 . P in io n S h a ft L ock
Fig. 4B-1--8-1 / 2 " and 8 -7 /8 " Ring Gear Axle Cross-Section Typical
C o v e r
1 3 .
1 4 .
P in io n S h a ft
1 5 . R ing G e a r
1 6 . S id e G e a r
1 7 . B e a rin g C a p
Screw
1 8 . A x le S h a ft
A thrust pad mounted on the end of an adjusting screw
threaded into the carrier housing limits deflection of the ring
gear under high torque conditions.
Involute splines are incorporated in the axle shaft
flange and in the wheel hubs. This design provides for the
driving torque to be transmitted from the axle shaft to the
hub through the mating splines.
REAR AXLE OPERATION
A basic differential consists o f a set of four gears. Two
of these gears are called differential side gears, and the
other tw o are differential pinion gears. Som e differentials
have more than two pinion gears. Each side gear is splined
to an axle shaft. Consequently, each axle shaft must turn
w hen its side gear rotates.
1 9 . T h ru s t W a s h e r
2 0 . D if f e r e n t i a l P in io n
2 1 . S him
2 2 . P in io n R ear B e a rin g
2 3 . D r iv e P in io n