LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 900 (Rear Drive Axle) >> Repair Instructions >> Pinion Depth Adjustment (8.6, 9.5/9.5LD, & 11.5 Inch Axles)

Pinion Depth Adjustment (8.6, 9.5/9.5LD, & 11.5 Inch Axles)

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required

    IMPORTANT: Make sure all of the tools, the differential side bearing bores, and the pinion bearing cups are clean before proceeding.
  1. Lubricate the pinion bearings with axle lubricant. Refer to Fluid and Lubricant Recommendations .
  2. Install the pinion bearings into the axle housing.
    3. Fig 1: Assembling Special Tools In Axle Housing
    GM651745Courtesy of GENERAL MOTORS CORP.
  3. Assemble the following components into the axle housing:
    • For the 8.6 inch axle, assemble the J 21777-35 (1), the J 21777-43 (2), the J 21777-42 (3), and the J 21777-29 (4) as shown.
    • For the 9.5/9.5LD inch axles, assemble the J 21777-8 (1), the J 21777-43 (2), the J 21777-42 (3), and the J 45108  (4) as shown. See Special Tools .
    • For the 11.5 inch axle, assemble the J 44416-3 (1,4), the J 21777-43 (2), and the J 44416-2 (3) as shown.
  4. While holding the J 21777-43 stationary, install an inch-pound torque wrench on the nut of the J 21777-43 and tighten the nut until a rotating torque of 1.7 N.m (15 lb in) is obtained.

    Rotate the assembly several times in both directions in order to seat the pinion bearings.

  5. Check the rotating torque of the assembly. If the torque is less than 1.7 N.m (15 lb in), tighten the nut on the J 21777-43 until a rotating torque of 1.7-2.3 N.m (15-20 lb in) is obtained.
    6. Fig 2: Assembling Special Tools In Differential Carrier Bore
    GM651746Courtesy of GENERAL MOTORS CORP.
  6. Assemble the following components into the differential carrier bore of the axle housing:
    • For the 8.6 inch axle, assemble the J 21777-45 (1, 2) to the J 21777-1 (3) as shown.
    • For the 9.5/9.5LD inch axles, assemble the J 21777-86 (1, 2) to the J 21777-1 (3) as shown.
    • For the 11.5 inch axle, assemble the J 44416-1 (1, 2) to the J 21777-1 (3) as shown.
  7. Install the bearing caps.
    8. NOTE: Refer to Fastener Notice .
  8. Install the bearing cap bolts.

    Tighten:  Tighten the bearing cap bolts to 75 N.m (55 lb ft).

  9. Rotate the J 21777-1 within the J 21777-45, 8.6 inch axle, or the J 21777-86, 9.5/9.5LD inch axles, or the J 44416-1, 11.5 inch axle. The J 21777-1 must rotate back and forth freely within the discs. If the J 21777-1 does not rotate freely, disassemble the components, inspect for proper seating and/or mis-aligned components and re-assemble.
    10. Fig 3: J 21777-1 & J 44416-3
    GM670320Courtesy of GENERAL MOTORS CORP.
  10. Align the plunger of the J 21777-1 (1) to the 8.5 inch gage block setting of the J 21777-29, 8.6 inch axle, or the J 45108  , 9. See Special Tools .5/9.5LD inch axles, or the J 44416-3, 11.5 inch axle (2).
  11. Install the J 8001  to the J 21777-1 as follows:
    1. Loosely clamp the J 8001  onto the stem on the J 21777-1.
    2. Place the contact pad of the J 8001  onto the mounting post of the J 21777-1.
    3. With the contact pad of the J 8001  touching the mounting post of the J 21777-1, loosen the lock nut on the J 8001  and push down on the J 8001  until the needle the J 8001  has turned 3/4 of a turn clockwise.
    4. Tighten the clamp on the J 8001  finger tight.
  12. Move the plunger of the J 21777-1 back and forth until the needle of the J 8001  indicates the greatest deflection.

    The deflection is the point where the needle changes direction.

    13. Fig 4: Moving The Housing J 8001
    GM670316Courtesy of GENERAL MOTORS CORP.
  13. At the greatest point of deflection, move the housing of the J 8001  until the needle indicates zero.
  14. Move the plunger of the J 21777-1 back and forth again to verify the zero setting. Adjust the housing of the J 8001  as necessary to set the needle to zero.
  15. Rotate the plunger of the J 21777-1 away from the J 21777-29, 8.6 inch axle, the J 45108  , 9. See Special Tools .5/9.5LD inch axles, or the J 44416-3, 11.5 inch axle, until it no longer touches the J 21777-29, the J 45108  , or the J 44416-3. See Special Tools .
  16. The value indicated on the J 8001  is the thickness of the shim needed in order to set the depth of the pinion.
  17. Select the shim that indicates the proper thickness. Measure the shim with a micrometer in order to verify that the thickness is correct.
  18. Remove the pinion depth setting tools.
  19. Remove the pinion bearings.
  20. Install the pinion shim between the pinion gear and the inner pinion bearing. Refer to Drive Pinion Bearings Replacement (8.6, 9.5/9.5LD, and 11.5 Inch Axles) .
scientia non olet · About LEMON Manuals