The ring gear (32) and pinon gear (8) are supplied as a
matched set. Both gears are etched for verification with
matching numbers. If a new gear set is being used,
verify that the matching numbers are the same on both
the ring and pinion gear before assembling the front dif-
ferential (Fig. 33).
SHIMMING
DIMENSION
The distance from the center line of the ring gear to the
bottom of the pinion gear teeth is 3.750 inches (5.525
cm). This distance represents the best running position
for the gear set (Fig. 32).
MATCHING
NUMBERS
On the end of each pinion gear, there is an etched num-
ber indicated by plus (+), minus (–), or zero (0). This
number indicates a shimming dimension for the best
running position of the gear set. This dimension is con-
trolled by shimming between the the bearing cup (10)
and the carrier assembly (15) (Fig. 33).
Figure 33
When reusing an old ring gear and pinion gear shaft set,
measure the old shim pack thickness and build a new
shim pack to the same thickness. Measure each shim
separately with a micrometer. Add each shim thickness
to get the total shim pack thickness.
For example: If a pinion gear shaft is etched +4, this pin-
ion would require 0.004 inch less shims than a pinion
etched ”0”. By removing shims, the running position is
increased to 3.754 inches. The +4 represents a 0.004
inch increase in the running position. On the other hand:
If a pinion gear shaft is etched –4, this pinion would re-
quire 0.004 inch more shims than a pinion etched ”0”. By
adding shims, the running position is decreased to
If a new gear set is being used, note the (+) or (–) etching
on both the old and new pinion gear shaft. Change the
thickness of the new shim pack to compensate for the
difference between these two dimensions.
For example: If the old pinion gear shaft reads + 2 and
the new gear is –2, add 0.004 inch of shims to the old
shim pack (see Table 1).
3.746
inches. The –4 represents a 0.004 inch decrease
in the running position.
NOTE: All shims (14, 21, and 31) are available in thick-
nesses of 0.003, 0.005, 0.010, and 0.030 inch.
Old Pinion
Marking
–4
New Pinion Marking
–3
–2
–1
0
+1
+2
+3
+4
+4
+3
+2
+1
0
+0.008
+0.007
+0.006
+0.005
+0.004
+0.003
+0.002
+0.001
0
+0.007
+0.006
+0.005
+0.004
+0.003
+0.002
+0.001
0
+0.006
+0.005
+0.004
+0.003
+0.002
+0.001
0
+0.005
+0.004
+0.003
+0.002
+0.001
0
+0.004
+0.003
+0.002
+0.001
0
+0.003
+0.002
+0.001
0
+0.002
+0.001
0
+0.001
0
0
–0.001
–0.002
–0.003
–0.004
–0.005
–0.006
–0.007
–0.008
–0.001
–0.002
–0.003
–0.004
–0.005
–0.006
–0.007
–0.001
–0.002
–0.003
–0.004
–0.005
–0.006
–0.001
–0.002
–0.003
–0.004
–0.005
–1
–2
–3
–4
–0.001
–0.002
–0.003
–0.004
–0.001
–0.002
–0.003
–0.001
–0.002
–0.001
Table 1
1.
If the bearing cone (9) was removed, press new
bearing cone onto the shaft of the pinion gear (8) (Fig.
34).
Figure 34
Workman 4000 Series
Page 10 – 23
Front Wheel Drive (4WD)
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