Depth Gauge Check

1. NOTE: If any of the gauge surfaces become nicked, the high spots must be removed with a medium India oilstone to ensure correct readings.

   Place a new inner differential pinion bearing (4630) over the proper aligning adapter and insert into the differential pinion bearing retainer. Place the outer differential pinion bearing (4621) (new or used if in good condition) into the rear axle pinion bearing cup (4628) and assemble the handle onto the screw and hand-tighten. Note the 3/8 inch square drive in the handle to be used for obtaining the proper differential pinion bearing preload. Tighten to preload of 2.25-4.52 Nm (20-40 lb-in).

2. Center the proper gauge tube into the differential pinion bearing bore. Install the bearing caps and tighten capscrews to 109-122 Nm (80-90 lb-ft).

3. NOTE: The feeler gauge fit between the gauge tube and the gauge block should be a slight drag-type feeling. Make sure shims or feeler gauges are free of dirt to insure a correct reading.

   Using a feeler gauge tool or shims, select the thickest feeler shim that will enter between the gauge tube and the gauge block. Insert the feeler gauge directly along the gauge block to ensure a correct reading.

   
   
   
   
   
   

   Item	Part Number	Description
   1	T80T-4020-F42	Gauge Block (Part of T80T-4020-A)
   2	T78P-4020-A15	Gauge Disc (Part of T79P-4020-A)
   3	4621	Differential Pinion Bearing (Outer)
   4	T76P-4020-A11	Driver Handle (Part of T79P-4020-A)
   5	4630	Differential Pinion Bearing (Inner)
   6	T80T-4020-F43	Screw (Part of T80T-4020-A)
   7	T76P-4020-A3	Aligning Adapter (Part of T79P-4020-A)
   8	D80T-4020-F48	Gauge Tube

4. NOTE: If the service pinion gear is marked with a plus (+) reading, this amount must be subtracted from the thickness dimension obtained between gauge block and gauge tube.

   NOTE: If the service pinion gear is marked with a minus (-) reading, this amount must be added to the thickness dimension obtained between gauge block and gauge tube.

   NOTE: In addition, you must use the exact same new inner pinion bearing used in the previous steps.

   After the correct feeler gauge feel is obtained, check the reading. This is the thickness of pinion shims required providing that, upon inspection of the service pinion gear, the button is etched "O."

5. NOTE: If a baffle or slinger is used, replace with a new one upon assembly and measure as part of the shim stack.

   Remove the inner pinion bearing cup and install the correct thickness of pinion shims in the carrier bore. Reinstall the pinion bearing cup and baffle (if used).