Axle Assembly - Hummer H1 Service Manual

9-32 Axles, Suspension, and Frame
Figure 9-79: Differential Assembly

Axle Assembly

NOTE: PINION DEPTH SETTING: Pinion gear depth is the
distance from the end face of the pinion to the center line of the
output shafts. The dimension is controlled by shims between
pinion gear rear bearing cup and differential housing. The pin-
ion gear is etched with two identifying numbers. The first num-
ber identifies ring gear and pinion gear as a matched set, and
the second number represents pinion depth variance. The sec-
ond number is preceded by a plus (+) or minus (-) which repre-
sents the amount the gear set varies from the standard setting of
2.547 in. (6.46 cm). If using original gear set, use original pin-
ion depth shim as a starter shim and proceed to step 4.
1. Measure thickness of original pinion depth shim and
record for reference (Figure 9-80).
Figure 9-80: Pinion Depth Shim
2. Check pinion depth variance number marked on old and
new pinion gears and record
Table 4.
PINION GEAR
Figure 9-81: Pinion Depth Variance Number
DIFFERENTIAL
ASSEMBLY
(Figure 9-81). Refer to
PINION DEPTH
VARIANCE
NUMBER
Location
_________________________________________
NOTE: If the old pinion is marked -3 and the new pinion is
marked +2, the procedure would be as follows: Refer to Old
Pinion Marking column at left side of table and locate -3 in this
column. Then read to right, across table, until under +2 in New
Pinion Marking column. The box where two columns intersect
is amount of shim thickness change required. In this case, the
number in the intersecting box is -0.005 in. (0.13 mm) which
represents the amount to be subtracted from the old shim thick-
ness. If the box number had been a (+) figure, this amount
would be added to the old shim thickness. The actual pinion
depth measurement must be performed and final shim thick-
ness adjusted as necessary. Pinion shims are available from
0.084-0.111 in. (2.13-2.82 mm) in increments of 0.0005 in.
(0.0127 mm).
3. Refer to Old and New Pinion Marking columns on pinion
variance table. Note on table where old and new pinion
depth variances intersect. This will determine amount to
be added or subtracted from original pinion depth shim for
desired pinion depth starter shim.
4. Rotate housing so front pinion bearing cup bore faces up
(Figure 9-82).
DRIVER
HANDLE
J–8092
Figure 9-82: Pinion Front Bearing Cup
BEARING CUP
INSTALLER
J–8611-01
PINION FRONT
BEARING CUP
HOUSING
Installation
®