Runouts

If the ring gear runout check (before disassembly) exceeds specification, the condition may be caused by a warped ring gear, a damaged differential 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 differential case with a hammer and a drift.





2. Install the differential assembly including the differential bearing cups and shims in the axle housing. Tighten the bearing cap bolts to 95-115 Nm (70-85 ft. lbs.).





3. Rotate assembly to ensure proper seating of differential bearings.





4. Check the runout of the differential case flange with a Dial Indicator with Bracketry TOOL-4201-C or equivalent. If the runout is within specification, a maximum of 0.076 mm (0.003 inch), install a new ring and pinion gear. If the runout exceeds specification, the ring gear is true and the trouble is due to either a damaged differential case or differential bearings. Visually inspect the differential bearings. If differential bearings are not damaged,replace both the differential case and differential bearings. Recheck the runout with new parts (differential case and differential bearings).

5. Install new differential bearings on the case hubs using Differential Side Bearing Replacer Tool T57L-4221-A1 and install the differential assembly in the carrier without the ring gear.

NOTE: Press against the bearing cone only.

6. Check the differential case runout again with the new differential bearings. If the runout is now within limits, use the new differential bearings for assembly. If the runout is still excessive, the differential case is damaged and should be replaced.