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3-22
REAR AXLE
bearings and
cups
with
a
.254" spacer
on
the
ring
gear side, (Fig. 58) into the differential housing. Do
not install the bearing caps.
(2)
Install a spacer on the right side that will leave
a
little end play.
(3) Measure the end play by using two sets
of
feel-
er gauges, (Fig. 59). Push the differential
to
the left
side or ring gear side of the carrier. Insert a feeler
gauge between the spacer and the right side of the
casting above the centerline of the case. Insert the
same thickness of another set
of
feeler gauges be-
tween the spacer and casting below the centerline of
the case. Increase the thickness of the gauges until a
heavy drag is felt.
(4) Rotate the differential several times in both di-
rections to seat the bearings and cups and re-measure
the feeler guage drag.
(5) Install a spacer totaling the combined thickness
of
the spacer and feeler gauge. This will provide zero
end play.
(6) Measure the drive gear backlash (Fig. 60) and
refer to the "Differential Preload Spacer Selection
Chart" for the proper spacers to provide .004" to
.007" backlash. Measure the backlash at 90" intervals.
(7) Remove the differential from the carrier hous-
ing and install the proper spacers for left and right
sides as specified by the "Differential Preload Spacer
Selection Chart."
(8) Attach the spreader Tool C-3721 but do not
spread the housing at this time.
(9) Install the dial indicator Tool C-3339 on one
side of the housing and as near the centerline as pos-
sible. Position the anvil of the dial indicator in con-
tact with the opposite side of the housing (Fig. 46).
(10) Observe the dial indicator while tightening the
spreader tool. Spread the housing .010 to .015 inch.
CAUTION: Never spread the housing more than
.020
inch as the case may take a permanent set.
(11) Remove the dial indicator.
Fig. 59-Feeler
Gauges Measuring Thickness
Fig. 60-Finding
Mininum Back Lash
(12) Hold the bearing cups and the selected spacers
on the bearing cones and carefully install the differ-
ential assembly into the housing. Be certain the as-
sembly is properly seated in the housing.
(13) Release the spreader tool and remove
it.
(14) Install the bearing caps and alternate tighten-
ing the bolts to 40 foot-pounds and rotate to seat the
bearings.
(15) Install the dial indicator to the case with the
indicator parallel with the drive gear rotation and
with the anvil contacting one tooth.
(16) Determine the amount of backlash and mark
the tooth.
(17) To find the position of least backlash, take
readings on three more teeth approximately 90 de-
grees apart.
(18)
Using the teeth with the minimum backlash,
the dial indicator should read .004 to .007 inch. If
the reading is not within tolerance it will be necessary
to refer to the "Differential Preload Spacer Selection
Chart" and install different spacers.
(19) Make a gear tooth pattern test using red lead
and refer to the patterns in (Figs. 50 and 51).
(20)
Install the differential cover with a new gasket
and tighten the attaching bolts to 20 foot-pounds
torque.
NOTE: Be sure the gasketed surfaces are clean:
AXLE HOUSING IN STALL AT ION
NOTE: Refer to Paragraph "Installation of the Rear
Axle Shaft Assembly" when installing the rear axle
shaft.
(1)
With the body supported at the front of the
rear springs, position the rear axle housing spring
seats over the spring center bolts.
(2)
Install the spring clips (U bolts) and shock ab-
sorbers. Tighten the U bolt nuts to 45 foot-pounds
torque.
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