Dodge ram truck 3500 1996 Service Manual page 174

3 - 1 0 8 DIFFERENTIAL AND DRIVELINE
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B R
A D J U S T M E N T S
PINION GEAR DEPTH
GENERAL INFORMATION
Gears are supplied as matched sets only. The Iden­
tifying numbers for the ring and pinion gear are
etched into the face of each gear (Fig. 68). A plus (+)
number, minus (-) number or zero (0) is etched into
the face of the pinion gear. This number is the
amount (in thousandths of an inch) the depth varies
from the standard depth setting. The standard depth
provides the best teeth contact pattern.
DRIVE PINION
Fig. 68 Pinion Gear ID Numbers
The standard depth is the distance (Fig. 69) from
the centerline of the axle shaft/ring gear to the shoul­
der of the rear pinion bearing.
• Model 60 axle, the standard depth/distance is
127.00 mm (5.000 inches)
• Model 70 axle, the standard depth/distance is
136.525 mm (5.375 inches).
• Model 80 axle, the standard depth/distance is
147.625 mm (5.812 inches).
Compensation for depth variance is achieved by
two methods. One method is shims placed between
the pinion gear rear bearing cup and housing (Fig.
70). The second method is selective shim between the
pinion gear head and bearing cone.
If new gear set is being installed, note the depth
variance etched into original and new pinion gear..
Add or subtract the thickness of the original depth
shims to compensate for the difference in the depth
variances. Refer to the Depth Variance charts.
For example, i f old pinion is plus (+) 1 and the new
pinion is minus ( - ) 3, intersecting figure is (+) 0.004
inch (0.10mm). Add this amount to the original shim.
Or i f the old pinion is (-) 3 and the new pinion is (-)
2, intersecting figure is (-) 0.001 inch (0.025mm).
INNER PINION
STANDARD
DEPTH
Fig. 69 Pinion Gear Standard Depth/Distance
Fig. 70 Shim Locations
Subtract this amount from original shim. Refer to
the Pinion Gear Depth Variance Chart.
If equipped, the oil slinger must be measured
and the thickness included with the total shim
pack thickness.
Depth shim thickness for the new pinion gear must
be determined before installing differential case in
housing.
PINION DEPTH MEASUREMENT AND
ADJUSTMENT
Pinion gear depth measurement is necessary
when;
® Axle housing or differential case is replaced
• Pinion select shim pack is unknown
• Ring and pinion gears are replaced