Differential Runout Check

If the ring gear runout check (before disassembly) exceeds specification, the condition may be caused by a warped ring gear, a damaged case, excessively worn differential bearings or foreign material between mating surfaces (burrs, shavings, etc.). To determine the cause of excessive runout proceed as follows:

1. Remove the differential case from the axle housing and remove the bolts that attach the ring gear to the differential case. Remove the ring gear from the case with a hammer and drift.

Differential Assembly Installation:

2. Install the differential assembly with the bearing cups and shims. Tighten the bearing cup bolts to 95-115 N m (70-85 ft-lbs.).

Differential Case Flange Runout:

3. Check the runout of the differential case flange with a dial indicator Tool-4201-C. If the runout is within specification, (Max. 0.003 inch), install a new ring and pinion gear. If the runout exceeds specification, the ring gear is true and the concern is due to either a damaged case or bearings. Visually inspect the bearings. If bearings are not damaged replace both the case and bearings. Recheck the runout with new parts (case and bearings). Visually inspect the excitor ring for damage and replace if required.

Differential Bearing Removal:

4. Remove the differential case from the integral carrier and remove the differential bearings from the case using Remover Tool T7OP-4221-A or equivalent.

Differential Bearing Installation:

5. Install new differential bearings on the case hubs using Replacer Tool, T57L-4221-A or equivalent and install the differential assembly in the carrier without the ring gear.

NOTE: Press against the bearing cone only.

Checking Differential Case Runout With New Bearings:

6. Check the case runout again with the new bearings. If the runout is now within 0.076mm (Max. 0.003 inch), use the new bearings for assembly. If the runout is still excessive, the case is damaged and should be replaced.