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Home >> GMC >> 1992 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis >> Drivelines & Axles >> Differentials & Drive Axles >> Drive Axle - 7.5" - 9.5" >> Adjustments >> Backlash & Final Assembly

Backlash & Final Assembly

  1. Rotate pinion and differential case several times to seat bearings. Using a dial indicator mounted to axle housing, check ring gear backlash at 4 different teeth locations around ring gear. Install indicator in line with gear rotation and perpendicular to tooth angle.
  2. Pinion flange must be locked in position or held rigid while taking each backlash reading. Four backlash readings should not vary more than .002" (.05 mm).
  3. Total backlash reading should be .005-.009" (.13-.23 mm). If backlash is incorrect, adjust side bearing shims as necessary. After backlash adjustment is completed, perform gear tooth contact pattern check. See GEAR TOOTH CONTACT PATTERNS article in the GENERAL INFORMATION section.
  4. If pattern is incorrect, adjust pinion or ring gear as required. Install axle shafts, "C" locks, pinion shaft and lock bolt. Install rear housing cover and add gear oil. See Figure.
    NOTE: DO NOT  change total shim pack thickness for each side bearing. If a shim is removed from one side, add same thickness shim to other side.
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