Pinion Depth Adjustment 10.5 Inch Axle
- Install the differential, if necessary. Refer to
Differential Replacement.
Important: Measure and record the thickness of the pinion gear bearing retainer shim before any service procedures are performed to the pinion gear bearing retainer assembly.
- Install the original shim to the pinion bearing retainer. If the original shim is not available, install a 0.41 mm (0.016 in) shim to build pinion depth.
Important: Do not apply sealant to the pinion gear bearing retainer at this time.
- Install the pinion gear bearing retainer.
Notice: Refer to Fastener Notice in the Preface section.
- Install the pinion gear bearing retainer bolts.
Tighten
Tighten the pinion gear bearing retainer bolts to 88 N·m (65 lb ft).
- Adjust the backlash. Refer to
Backlash Adjustment.
- Perform a gear tooth pattern check on the pinion and the ring gear. Refer to
Gear Tooth Contact Pattern Inspection.
- If the gear tooth contact pattern indicates a high or a low flank contact pattern, adjust the pinion depth by doing the following:
7.1. | Remove the pinion gear bearing retainer bolts. |
7.2. | Remove the pinion gear bearing retainer. |
• | If the gear tooth contact pattern shows a high flank contact pattern, install a shim one size larger. |
• | If the gear tooth contact pattern shows a low flank contact pattern, install a shim one size smaller. |
7.4. | Install the new shim to the pinion gear bearing retainer. |
7.5. | Install pinion gear bearing retainer. |
7.6. | Install pinion gear bearing retainer bolts. |
Tighten
Tighten the pinion gear bearing retainer bolts to 88 N·m (65 lb ft).
7.8. | If the gear tooth pattern is still incorrect, adjust the shim thickness as necessary and recheck the gear tooth pattern of the pinion and the ring gear. |
- Inspect the backlash between the pinion and the ring gear and adjust, if necessary. Refer to
Backlash Adjustment.
The pinion shims are available in the following sizes:
Shim Sizes
Pinion Depth Adjustment 8.6, 9.5/9.5LD, and 11.5 Inch Axles
Tools Required
• | J 45108
Pinion Setting Gage Block (9.5/9.5LD inch Axle) |
• | J 21777-86
Side Bearing Disc (9.5/9.5LD inch Axle, 2 Required) |
• | J 44416
Pinion Setting Adapter Kit (11.5 inch axle) |
Important: Make sure all of the tools, the differential side bearing bores, and the pinion bearing cups are clean before proceeding.
- Lubricate the pinion bearings with axle lubricant. Refer to
Fluid and Lubricant Recommendations
.
- Install the pinion bearings into the axle housing.
- 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. |
• | 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. |
- 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.
- 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.
- 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. |
- Install the bearing caps.
Notice: Refer to Fastener Notice in the Preface section.
- Install the bearing cap bolts.
Tighten
Tighten the bearing cap bolts to 75 N·m (55 lb ft).
- 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.
- 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
, 9.5/9.5LD inch axles, or the J 44416-3, 11.5 inch axle (2).
- Install the
J 8001
to the J 21777-1 as follows:
11.1. | Loosely clamp the
J 8001
onto the stem on the J 21777-1. |
11.2. | Place the contact pad of the
J 8001
onto the mounting post of the J 21777-1. |
11.3. | 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. |
11.4. | Tighten the clamp on the
J 8001
finger tight. |
- 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.
- At the greatest point of deflection, move the housing of the
J 8001
until the needle indicates zero.
- 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.
- Rotate the plunger of the J 21777-1 away from the J 21777-29, 8.6 inch axle, the
J 45108
, 9.5/9.5LD 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.
- The value indicated on the
J 8001
is the thickness of the shim needed in order to set the depth of the pinion.
- Select the shim that indicates the proper thickness. Measure the shim with a micrometer in order to verify that the thickness is correct.
- Remove the pinion depth setting tools.
- Remove the pinion bearings.
- Install the pinion shim between the pinion gear and the inner pinion bearing. Refer to
Drive Pinion Bearings Replacement
.