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 re-established.

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.

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TOOL SETUP

The tool 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.

(Special tool #C-4995A, Tool, Differential Bearing Torque)

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

MEASUREMENT PROCEDURE

Position the differential on a clean work surface.

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Four Wheel Drive (4WD) transmissions do not use the lock tool, there is no differential. For Front Wheel Drive (FWD) and All Wheel Drive (AWD) transmissions, install the lock tool (2) between the differential (1) pinion gears next to the link pin to prevent the differential from rotating.
(Special tool #10425, Tool, Pinion and Side Gear Locking)
Position the transmission and bell housing on a suitable clean work bench.
Install new bearing races with the original select shims.
Install the differential with new bearings lightly lubricated with transmission fluid in the transmission housing.
Install the bellhousing.
Install the bolts to hold the bellhousing to the transmission housing. Tighten bolts to 50% of the specified torque value. Refer to TORQUE SPECIFICATIONS .
Insert modified tool into the differential until the sleeve (C-4995-1) enters the halfshaft spline in the differential side gear.
(Special tool #C-4995A, Tool, Differential Bearing Torque)
Tighten the nut until the sleeve expands tightly in the side gear.
Tighten the jamb nut to prevent the center shaft from rotating in the sleeve.
Using a suitable wrench, rotate the differential 20 rotations clockwise and 20 rotations counterclockwise.

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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.).
Adjust the turning torque by adding to or subtracting from the thickness of the select shims behind the differential bearing races.
After achieving proper differential turning torque, separate the bell housing from the transmission housing.
Install the transfer gear with new bearings into the transmission housing.
Install the bellhousing.
Install the bolts to hold the bell housing to the transmission housing. Tighten bolts to 50% of the specified torque value
Refer to TORQUE 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.
Using a suitable wrench, rotate the differential 20 rotations clockwise and 20 rotations counterclockwise.

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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.).
Adjust the turning torque by adding to or subtracting from the thickness of the select shims behind the transfer shaft bearing races.
Remove tool from the differential.
(Special tool #C-4995A, Tool, Differential Bearing Torque)
Separate the bellhousing from the transmission housing.
Remove the differential and transfer gear.

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On FWD and AWD transmissions, remove lock tool (2) from the differential (1).
(Special tool #10425, Tool, Pinion and Side Gear Locking)
Prepare transmission components for final assembly.