GMC 1976 ZEO 6083 Maintenance Manual page 178

Figure 38-Location of Pinion Marking
10. Select the correct pinion shim to be used dur-
ing pinion reassembly on the following basis :
a. If a service gear set or a production gear set
with no paint marking, on outer circumference of
ring gear is being used, the correct shim will have a
thickness equal to the indicator gauge reading found
in Step 9. (figure 38)
b. If the gear set being used is painted "+"
or "-", the correct shim will be determined as fol-
lows .
Ring gear painted "+" (plus), the shim thickness
indicated by the dial indicator on the pinion setting
gauge must be INCREASED by the amount painted
on the ring gear . (figure 38)
Ring gear painted "-" (minus), the shim thick-
ness indicated by the dial indicator on the pinion
setting gauge must be DECREASED by the amount
painted on the ring gear . (figure 38)
Figure 39-Installing Pinion Rear Bearing
FINAL DRIVE 3C- 1 5
Figure 40-Installing Pinion Front Bearing And Shim
11 . Remove pinion depth checking tools and
front bearing from housing.
39 .
12 . Install rear pinion bearing as shown in Figure
NOTE :
Shims are available from .040" to .070"
in increments of .002" .
13 . Position correct shim on drive pinion and
install the drive pinion front bearing as shown in
Figure 40 .
PINION BEARING PRE-LOAD
ADJUSTMENT
1 . The pre-load shim will have to be changed or
Figure 41-Checking Shim Thickness for Pinion
Bearing