Reassembly; Gear Set Identification - GMC 1982 Light Duty Truck Service Manual

Fig. 4B5-14-Removing Inner Bearing
facilitate initial removal and disassembly, providing all
openings are closed. Breathers, vented shift units, and all
other openings should be tightly covered or closed to prevent
the possibility of water entering the assembly.
Parts should be thoroughly dried immediately after
cleaning. Use soft, clean, lintless absorbent paper towels or
wiping rags free of abrasive m aterial, such as lapping
com pound, m etal filings or c o n tam in ated oil. Bearings
should never be dried by spinning with compressed air.
Inspection
It is impossible to over stress the importance of careful
and thorou gh inspection of drive unit parts prior to
reassembly. Thorough visual inspection for indications of
wear or stress, and the replacement of such parts as are
necessary will eliminate costly and avoidable drive unit
failure.
Inspect all bearings, cups and cones, including those
not removed from parts of the drive unit, and replace if
rollers or cups are worn, pitted or damaged in any way.
Remove parts needing replacement with a suitable puller or
in a press with sleeves. Avoid the use of drifts and hammers.
They may easily multilate or distort component parts.
Refer to Section 4B for bearing diagnosis.

REASSEMBLY

W here silicone RTV gasket material is used, Dow
Silastic No. R TV -732 Black and General Electric No.
RTV-1473 Black (or equivalent) should be used.
Failure to use appropriate gasket material will
NOTICE:
cause axle to leak.
Removal of all gaskets including silicone RTV is
accomplished by peeling or scraping the used gasket off both
m ating surfaces. A pplication of silicone RTV gasket
material is as follows:
1. Remove dirt, grease or moisture from both mating
surfaces.
2. Dry both surfaces.
3. Apply thin bead, approxim ately
completely around one mating surface and all fastener
holes to assure complete sealing and prevent leakage.
C AU T IO N : M in o r co n c e n tra tio n s o f acetic acid
va p o r m a y be p rod u ce d d u rin g
A d e q u a te v e n tila tio n should be p rovided w h e n
silicone RTV is a p p lie d in confined areas.
F u r th e r , e y e c o n ta c t w i t h th e s e s ilic o n e R TV g a s ­
k e t m a t e r ia l s m a y c a u s e i r r i t a t i o n ; i f e y e c o n ta c t
t a k e s p la c e , flu s h e y e s w i t h w a t e r f o r 1 5 m in u te s
a n d h a v e e y e s e x a m in e d b y a d o c to r.
4. Assemble the components imm ediately to permit
silicone RTV gasket material to spread evenly.
W hen rebuilding any assembly, always use torque
values on fasteners as specified.
G e a r Set Identification
If a new gear set (drive pinion and ring gear) is being
installed into the carrier, refer to the following gear set
information before starting reassembly. However, if the
original gear set is to be installed, start with Pinion and Case
Reassembly.
The following information is marked on current drive
pinion and gear sets, and will be used for identifying,
matching and adjusting procedures. The items listed are
keyed to illustration (Fig. 4B5-15).
1. Part Number.
2. Tooth Combination Number.
The Part N um b er and Tooth Combination N um ber are
found on the shank or threaded end of all pinions. On
the ring gears, the numbers are normally found on the
front face of the gear. However, as an option, they may
be located at the gear O.D.
For any given pinion and gear set, the ring gear always
has an even part number (i.e. 36786) and the matched
pinion has the odd number (i.e. 36787).
The tooth combination number (i.e. 5-37) indicates the
gear set has a 5 tooth pinion and a 37-tooth ring gear,
the equivalent of a 7.4 to 1 gear ratio.
Always refer to the
Combination N u m b er before starting the reassembly.
Check to be certain the pinion and gear match.
Fig. 4B5-15-Gear Set Identification
REAR A X LE 4 B 5 -7
1/8" d iam eter
a p p lic a tio n .
Part N u m b e r and Tooth