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Bearing Turning Torque Measurement

To determine proper select shim thickness for the differential and transfer gear bearings, the turning torque must be measured. If just the differential or transfer gear bearings are being replaced, it is not necessary to measure the bearing turning torque. The original factory installed shims will be sufficient to properly preload the bearings when the transmission is assembled. If the differential, transfer gear, or transmission housing castings are replaced, the differential and transfer gear bearing turning torque will need to be reestablished.

Verify that the bearings and races are NEW  and properly installed on/in clean components with the factory installed select shims behind the bearing races. Lightly lubricate the bearings with transmission fluid.

GC0154901Courtesy of CHRYSLER GROUP, LLC

TOOL SETUP 

(special tool #C-4995A, Tool, Differential Bearing Torque) must be modified to be compatible with the following operation. Two 3/8-24 nuts (1) must be added to keep the center shaft from rotating in the cone and sleeve.

  1. Remove the NYLOK® nut and expander cone from the center shaft.
  2. Remove the sleeve from the center shaft.
  3. Install a nut (1) on the center shaft and tighten it against the existing nut. Install the sleeve.
  4. Install the 2nd nut (1) inside the sleeve just far enough to install the cone and nut.
  5. Install the cone and nut tight enough to keep the center shaft from rotating inside the cone and sleeve.

MEASUREMENT PROCEDURE 

  1. Position the differential on a clean work surface.
    GC0154862Courtesy of CHRYSLER GROUP, LLC
  2. Install the lock tool (special tool #10425, Tool, Pinion and Side Gear Locking) (2) between the differential (1) pinion gears next to the link pin to prevent the differential from rotating.
  3. Position the transmission and bell housing on a suitable clean work bench.
  4. Install new bearing races with the original select shims.
  5. Install the differential with new bearings lightly lubricated with transmission fluid in the transmission housing.
  6. Install the bell housing.
  7. Install the bolts to hold the bell housing to the transmission housing. Tighten bolts to 50% of the specified torque value. Refer to TECHNICAL SPECIFICATIONS .
  8. Insert modified tool (special tool #C-4995A, Tool, Differential Bearing Torque) into the differential until the sleeve (C-4995-1) enters the halfshaft spline in the differential side gear.
  9. Tighten the nut until the sleeve expands tightly in the side gear.
  10. Tighten the jamb nut to prevent the center shaft from rotating in the sleeve.
  11. Using a suitable wrench, rotate the differential 20 rotations clockwise and 20 rotations counterclockwise.
    GC0154772Courtesy of CHRYSLER GROUP, LLC
  12. Using a torque wrench (1), measure the turning torque of the differential (2) after the initial break away. It should measure between 1.7 to 2.8 N.m (15 and 25 in lbs).
  13. Adjust the turning torque by adding to or subtracting from the thickness of the select shims behind the differential bearing races.
  14. After achieving proper differential turning torque, separate the bell housing from the transmission housing.
  15. Install the transfer gear with new bearings into the transmission housing.
  16. Install the bell housing.
  17. Install the bolts to hold the bell housing to the transmission housing. Tighten bolts to 50% of the specified torque value. Refer to TECHNICAL SPECIFICATIONS .
    NOTE:

    The turning torque of the differential and the transfer gear will be higher than the differential alone. The ring gear is driving a smaller gear on the transfer shaft.

  18. Using a suitable wrench, rotate the differential 20 rotations clockwise and 20 rotations counterclockwise.
    GC0154772Courtesy of CHRYSLER GROUP, LLC
  19. Using a torque wrench (1), measure the turning torque of the differential (2) after the initial break away. It should measure between 3.4 to 6.8 N.m (30 and 60 in lbs).
  20. Adjust the turning torque by adding to or subtracting from the thickness of the select shims behind the transfer shaft bearing races.
  21. Remove tool C-4995 from the differential.
  22. Separate the bell housing from the transmission housing.
  23. Remove the differential and transfer gear.
    GC0154862Courtesy of CHRYSLER GROUP, LLC
  24. Remove lock tool 10425 (2) from the differential (1).
  25. Prepare transmission components for final assembly.
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