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Home >> Lincoln >> 1998 >> Navigator RWD >> Repair and Diagnosis >> Drivelines & Axles >> Differentials & Drive Axles >> Drive Axle - Rear - 8.8" & 9.75" Ring Gear >> Inspection Procedures >> Differential Case RUNOUT

Differential Case RUNOUT

  1. Remove differential case from axle housing assembly. Remove retaining bolts and ring gear. Install differential case with bearing races and preload shims into axle housing assembly.
  2. Install bearing caps and retaining bolts. Tighten bearing cap retaining bolts to specification. See TORQUE SPECIFICATIONS  . Rotate differential case to ensure bearings are properly seated.
  3. Assemble dial indicator on axle housing assembly with tip of dial indicator contacting ring gear surface of differential case. Adjust dial indicator to zero.
  4. Rotate differential case and note differential case runout. If differential case runout is within .003" (.08 mm), install a NEW ring gear and pinion.
  5. If differential case runout exceeds .003" (.08 mm), ring gear is okay. The problem area is damaged axle housing assembly or worn bearings on differential case.
  6. Visually check for damaged bearings. If bearings are okay, replace both bearings and differential case. Recheck differential case runout using NEW components.
  7. If differential case runout is now within .003" (.08 mm), use components for reassembly. If differential case runout exceeds .003" (.08 mm), axle housing assembly is damaged and should be replaced.
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