GMC 1982 Light Duty Truck Service Manual page 477

E X A M P L E S O F C A L C U L A T I O N :
EXAMPLE NO. 1
Original Pack Thickness
Original Variation (PC +2)
Standard Pack Thickness
New Variation (PC +5)
New Pack Thickness
EXAMPLE NO. 2
Original Pack Thickness
Original Variation (PC +2)
Standard Pack Thickness
New Variation (PC +5)
New Pack Thickness
EXAMPLE NO. 3
Original Pack Thickness
Original Variation (PC +2)
Standard Pack Thickness
New Variation (PC -5)
New Pack Thickness
EXAMPLE NO. 4
Original Pack Thickness
Original Variation (PC -2)
Standard Pack Thickness
New Variation (PC-5)
New Pack Thickness
For correct installation, heat the ring gear in water to
approxim ately 160°-180° for about ten m inutes before
assembly. This will allow an easier fit of the gear over the
differential case pilot, w ithout the use of a press, and
without damaging the case and ring gear mating surfaces.
NOTICE:
the case, as this would cause excessive metal particles
to lodge between the gear and case, thus resulting in
gear runout. Proper installation should, therefore,
incorporate preheating the gear as described above to
assure correct interference fit and to eliminate metal
pick-up.
Differential case and ring gear bolts should be used for
service replacement of rivets if required. Replacement bolt
kits are available through service. Refer to specifications for
service bolt instructions and torque.
D ifferen tial Pinion and Side G e a r (Fig. 4 B 5 -2 1 )
Assem bly
.030"
1. Position thrust washer and side gear in ring gear and
.002
case half assembly.
.028"
4.
i
.005 2. Place spider with pinions and th ru st washers in
.033" position.
3. Install component side gear and thrust washer.
4. Align mating marks, position component case half and
.030"
4 -
T
draw assembly together with four bolts or capscrews
.002
equally spaced (Fig. 4B5-22).
.032"
T
.005
5. Check assembly for free rotation of differential gears
.037"
and correct if necessary.
6. Install remaining bolts and capscrews, tighten to the
correct torque.
.030"
.002
7. If bearings are to be replaced, press squarely and firmly
on differential case halves.
.005
.023"
Rolling Resistance Check of D ifferen tial Nest
1. Place differntial and ring gear assembly in a vise.
.030"
_ L
Use soft metal covers over vise jaw to protect ring gear.
i
.002
.032"
.005
.027"
REAR AXLE
The gear should not be pressed or driven on
Fig. 4B5-21--Pinion and Side Gears
4B 5-11
101931