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Pinion Angle: Aerostar

  1. Position protractor in vertical position, flush against 2 differential cover retaining bolts. Rotate protractor bubble indicator so that 90-degree mark aligns with indexing mark. Read protractor and calculate pinion angle. For example, if protractor indicates 85 degrees, pinion angle is 5 degrees.
  2. If necessary, adjust pinion angle by installing new upper control arm bushing. Install bushing so that notch is at 12 o'clock, 9 o'clock or 3 o'clock position as necessary. See Fig 1.
    Fig 1: Adjusting Pinion Angle (Aerostar)
    G92A22855Courtesy of FORD MOTOR CO.