Sierra Classic 2500 4WD V8-6.0L (2007)
Pinion Flange: Service and Repair
Rear Differential
Drive Pinion Flange/Yoke and/or Oil Seal Replacement (All Except 9.75 Inch Axle)
Drive Pinion Flange/Yoke and/or Oil Seal Replacement (All Except 9.75 Inch Axle)
Tools Required
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J 8614-01 Flange/Pulley Holding Tool
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J 22388 Rear Axle Pinion Oil Seal Installer - Rear (8.6 inch, 9.5 inch axle)
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J 44414 Rear Axle Pinion Oil Seal Installer (10.5 inch, 11.5 inch axle)
Removal Procedure
1. Important:
Observe and mark the positions of all the driveline components, relative to the propeller shaft and the axles, prior to disassembly. These
components include the propeller shafts, drive axles, pinion flanges, output shafts, etc. Reassemble all the components in the exact places in which
you removed the parts. Follow any specifications, torque values, and any measurements made prior to disassembly.
Raise the vehicle. Refer to Vehicle Lifting.
2. Remove the tire and wheel assemblies (8.6 inch, 9.5 inch axles).
3. Remove the rear brake calipers (8.6 inch, 9.5 inch axles). Refer to Rear Brake Caliper Replacement.
4. Remove the brake rotors (8.6 inch, 9.5 inch axles). Refer to Rear Brake Rotor Replacement.
5. Remove the axle shafts (10.5 inch, 11.5 inch axle). Refer to Rear Axle Shaft and/or Gasket Replacement.
6. Reference mark the rear propeller shaft (3) to the rear axle pinion yoke (4).
7. Disconnect the propeller shaft from the axle. Wrap the bearing caps with tape in order to prevent the loss of bearing rollers. Support the propeller
shaft as necessary.
8. Measure the amount of torque required to rotate the pinion. Use an inch-pound torque wrench. Record this measurement for reassembly. This will
give the combined preload for the following components:
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The pinion bearings
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The pinion pilot bearing (10.5 inch axle)
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The pinion oil seal
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The differential case bearings
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The axle bearings (8.6 inch, 9.5 inch axles)
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The axle seals (8.6 inch, 9.5 inch axles)
