GMC 1982 Light Duty Truck Service Manual page 467

ROCKWELL 12 RING GEAR AXLE
All rear axle a tta c h in g fasteners are an
NOTICE:
important attaching part in that it could affect the
performance of vital components and systems, an d /o r
could result in m ajor repair expense. It m ust be
replaced with one of the same part number or with an
General Description ..........................................................4B5-1
On-Vehicle S ervice........................................................... 4B5-3
Axle A ssem bly................................................................. 4B5-3
Axle V e n t.......................................................................... 4B5-3
Axle S h a f t ......................................................................... 4B5-3
Wheel Bolt R eplacem ent.............................................. 4B5-3
Bearing A djustm en t............................................... ....... 4B5-3
Drive Pinion Oil S e a l..................................................... 4B5-3
Differential C a rrie r......................................................... 4B5-3
R e m o v a l.......................................................................... 4B5-3
Installation..................................................................... 4B5-4
Unit R e p a ir......................................................................... 4B5-4
Differential and Gear Assembly.................................. 4B5-4
R e m o v a l.......................................................................... 4B5-4
Disassembly.................................................................... 4B5-5
Fig. 4B5-1 --Single-Reduction Carrier
SECTION 4B5
CONTENTS
Cleaning and Inspection................................................. 4B5-6
R eassem bly ...................................................................... 4B5-7
Gear Set Identification............................................... 4B5-7
Pinion and Cage Assembly........................................ 4B5-9
Selecting Pinion S h im s ..............................................4B5-10
Differential and G e a r ................................................. 4B5-10
Checking Rolling Resistance.................................. 4B5-11
Installing Bearing C u p s ............................................ 4B5-12
Installing Differential and G e a r ............................. 4B5-12
Adjusting Bearing Pre lo ad ...................................... 4B5-13
Installing Thrust S c re w ............................................ 4B5-13
Specifications and T o r q u e ....................................... 4B5-15
GENERAL DESCRIPTION
1) employs a heavy duty hypoid drive pinion and ring gear.
The differential and gear assembly is mounted on tapered
roller bearings. The straddle mounted pinion has two
tapered roller bearings in front of the pinion teeth which
take the forward and reverse thrust and a third bearing
behind the pinion teeth to carry the radial load.
equivalent part if replacement becomes necessary. Do
not use a replacem ent part of lesser quality or
substitute design. Torque values must be used as
specified during reassembly to assure proper retention
of this part.
Pinion and Cage Assembly...................................... 4B5-5
R em o v al..................................................................... 4B5-5
Disassembly........................ ...................................... 4B5-6
The Rockwell Single-Reduction Final Drive (Fig. 4B5-
REAR A X LE 4 B 5 -1