Ring Gear Backlash Measurement/Correction

Differential Ring Gear Backlash should be measured and adjusted after the following scenarios:

1. Ring and pinion gear replacement
2. Pinion head bearing replacement
3. Pinion depth (shim) adjustment
4. Differential case replacement
5. Differential side bearing replacement
6. Axle housing replacement
   NOTE: If Spreader W-129-B is installed, make sure tension on axle housing is relieved.
   Fig 1: Measuring Ring Gear Backlash

   Courtesy of CHRYSLER LLC
7. Set up Dial Indicator Set C-3339A as shown in Fig 1 to measure ring gear backlash:
   1. Clamp SP-5426 (1)
   2. Post SP-5425-B (2)
   3. Metric Dial Indicator 9524 (3)
8. Rotate ring gear one direction to take up clearance to pinion. Verify indicator tip is in contact with ring gear and zero indicator. Rotate ring gear back and forth and record measurement. Ring gear backlash should be 0.13-0.18 mm (0.005-0.007 in.). Verify back lash measurement in four positions.
   Fig 2: Backlash Shim Correction

   Courtesy of CHRYSLER LLC
9. If backlash measurement is less than 0.13 mm (0.005 in.), it is necessary to decrease the snap ring thickness on the ring gear (left) side, and increase the thickness on the pinion (right) side.
10. If backlash measurement is greater than 0.18 mm (0.007 in.), it is necessary to increase the snap ring thickness on the ring gear (right) side, and decrease the thickness on the pinion (left) side.