Spicer Tandem Drive Axles Service Manual J340-S, J380-S, J400-S, W460-S - Manual (Page 21)

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PINION POSITION
19
Ring gears and pinions are supplied in matched sets only.
Matching numbers on both the pinion and ring gear are etched
for verification. If a new gear set is being used, verify the
numbers of each pinion and ring gear before proceeding with
assembly. (See Gear Set Identification, Pg. 2)
Pinion position is based on the nominal mounting distance
measured from the centerline of the ring gear to the nose of
the pinion. This dimension is controlled by selectively
shimming between the pinion cage assembly and the carrier
housing. The nominal dimension is 3.976 in. (100.990 mm).
NOTE: Be sure mounting surfaces and shims are free of burrs
and dirt prior to assembly as they will affect pinion position.
1 . To establish the correct nominal dimension by using a
pinion setting gauge, install pinion and cage assembly
into the carrier housing without shims. Tighten pinion
cage bolts to correct torque specifications. (See Torque
Specification Chart, Pgs. 33-34) Failure to tighten
properly may result in incorrect gear adjustment.
2 . Attach the step plate clamp assembly to the carrier
mounting flange. Locate step plate clamp screw over
center of pinion. Install step plate under clamp screw and
tighten to hold step plate securely in position.
NOTE: Be sure lugs on bottom of step plate straddle the
bearing staking indentions on end of pinion, or false reading
may occur. Also, make sure differential side bearing bores
are clean and free of nicks.
3 . Remove any burrs and wipe clean differential bearing
bore I.D.'s. Turn micrometer 90º to step plate. Install
assembled pinion setting gauge into bearing bores of
carrier housing until fully seated. Adjust micrometer so it
is directly over end of step plate. Run the micrometer
thimble down to measure the distance between the center
of the ring gear and the step plate. Make a note of this
dimension. See Figure 13.
NOTE: Because the step plate must be taken into consider-
ation, the thickness of the step plate (.400 in. (10.16 mm))
needs to be added to the measured value for the correct
micrometer distance.
4 . On the machined end of each pinion either a plus (+),
minus (-), or a zero (0) will be etched. (See Gear Set
Identification, Pg. 2) This number represents the amount
J Model W Model
Inches M M Inches M M
.720 18.29 .895 22.73
.721 18.31 .896 22.76
.722 18.34 .897 22.78
.723 18.36 .898 22.81
.724 18.39 .899 22.84
.725 18.41 .900 22.86
.726 18.44 .901 22.89
.727 18.47 .902 22.91
.728 18.49 .903 22.94
.729 18.52 .904 22.96
.730 18.54 .905 22.99
.731 18.57 .906 23.01
J Model W Model
Inches M M Inches M M
.732 18.60 .907 23.04
.733 18.62 .908 23.06
.734 18.64 .909 23.09
.735 18.67 .910 23.11
.736 18.69 .911 23.14
.737 18.72 .916 23.27
.738 18.75
.739 18.77
.740 18.80
.741 18.82
.742 18.85
.745 18.92
PINION ASSEMBLY