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Home >> GMC >> 1993 >> C3500 HD 5.7 K, Automatic >> Repair and Diagnosis >> Drivelines & Axles >> Differentials & Drive Axles >> Drive Axle - DANA 9.75", 10.5" & 11" (Full-Floating) >> Overhaul >> Differential Assembly >> Checking Ring Gear Backlash

Checking Ring Gear Backlash

  1. Mount dial indicator on drive axle housing. See Fig 1. Place dial indicator tip at heel end of ring gear tooth. Check backlash at 3 equally spaced locations around ring gear.
  2. Backlash should be .005-.009" (.13-.23 mm). Ensure variation between points checked is not more than .002" (.05 mm). High backlash is corrected by moving ring gear closer to drive pinion; low backlash is corrected by moving ring gear away from pinion. 3) To adjust backlash, remove both differential case side bearings. Move shims from one side to other.
  3. When backlash is correct, check ring gear tooth contact pattern. See GEAR TOOTH CONTACT PATTERNS article in GENERAL INFORMATION.
  4. To complete assembly, install new cover gasket and cover. Tighten cover bolts to specification. See TORQUE SPECIFICATIONS  table. Install axle shafts. Fill drive axle with lubricant.
    Fig 1: Checking Ring Gear Backlash
    G121014Courtesy of CHRYSLER CORP.
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