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Home >> Chevrolet >> 1990 >> Step Van 7.4 N, Standard >> Repair and Diagnosis (Single Page) >> Drivelines & Axles >> Differentials & Drive Axles >> Differential - EATON Positive Traction >> Adjustments >> 1-Piece Case >> Left Side Gear Backlash

Left Side Gear Backlash

  1. Install cam unit and thrust washer in flange end of case. Install pinion gears and thrust washer into differential. Ensure thrust washers are aligned with pinion shaft hole.
  2. Press side gear downward and install pinion shaft and lock screw. If side gear cannot be pressed down enough to install pinion shaft, install thinner thrust washer.
  3. Rotate pinion gear closest to lock screw so one tooth is pointing downward (perpendicular to ring gear flange). Insert a screwdriver firmly between side gear and pinion shaft.
  4. Install dial indicator on ring gear flange, with indicator stem positioned on tooth of pinion gear closest to lock screw.
  5. Pull pinion gear against case and rotate pinion gear back and forth and note backlash reading. Repeat procedure on the opposite pinion gear. Backlash should be .010-.018" (.25-.46 mm).
  6. Change thrust washer thickness to obtain correct backlash. If backlash is greater than specification, use thicker thrust washer. If it is less than specification, use thinner thrust washer.
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