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Home >> Ford >> 1996 >> Aerostar Van Window >> Repair and Diagnosis (Single Page) >> Drivelines & Axles >> Differentials & Drive Axles >> Drive Axle - 7.5" Ring Gear Differentials >> Ring Gear & Differential Case RUNOUT Checking Procedure >> Differential Case RUNOUT

Differential Case RUNOUT

  1. Remove differential case from differential housing assembly. Remove retaining bolts and ring gear. Install differential case with bearing races and preload shims into differential housing assembly.
  2. Install bearing caps in original location, Install and tighten bearing cap retaining bolts to proper specification. See TORQUE SPECIFICATIONS  . Rotate differential case to ensure bearings are properly seated.
  3. Assemble dial indicator on differential 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 differential 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 NEW  bearings and components for reassembly. If differential case runout exceeds .003" (.08 mm), differential housing assembly is damaged and should be replaced.
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