Service Manual J340-S, J380-S, J400-S, W460-S

ManualsBrandsSpicer ManualsCarTandem Drive Axles

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PINION POSITION

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 MM Inches MM

.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 MM Inches MM

.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