Article 2005 - Ford Rear Axle Housing Alignment Checking Procedure

TSB #127 - November 21, 1969
(F-100, E-100/200, Bronco - 1969-70)


If rear axle housing misalignment is suspected, perform the checking procedure outlined below.

    1. Raise the vehicle on any of the following (frame contact procedure is recommended). In all instances the rear axle is to be checked in an unloaded condition.
      a. Frame contact hoist.
      b. Short jack-stands
      c. Twin-post hoist with long jack stands.
    2. Using white chalk or paint, mark a small area at the centers of each rear tire; with a sharp object, scribe a vertical line in the marked area.

    3. Adjust both wheels so that the scribe marks are facing the front of the vehicle. Using a tape measure, measure the distance from the scribe mark on one tire to the scribe mark on the opposite tire and record this figure (front-of-tire reading).

    4. Rotate the rear wheels so that the scribe marks are facing the rear of the vehicle, 180° from the original position. Again measure the distance between the scribe marks and record this figure (rear-of-tire reading).

    5. The difference between the front-of-tire and rear-of-tire readings is the toe condition of the housing.

      EXAMPLE:
      Front-of-tire reading - 62-3/16"
      Rear-of-tire reading - 62-1/16"
      Toe-Out - 2/16" (or 1/8")

    6. Rotate the rear wheels so that the scribe marks are directly underneath the vehicle (on a frame contact hoist), or as near the bottom position as possible on a twin post hoist or jack stands. Again measure the distance between the scribe marks and record this figure (bottom-of tire-reading).

    7. The difference between the bottom reading, obtained in Step 6, and the average of the front-of-tire and rear-of-tire readings, obtained in Steps 3 and 4, is the camber condition of the housing.

      EXAMPLE:
      Average of front and rear reading - 62-2/16"
      Bottom-of-tire reading - 62-2/16"
      Difference - "0" Camber
    If the bottom-of-tire reading is greater than the average of the front-of-tire and rear-of-tire readings, the camber is negative (-). If the bottom-of-tire reading is smaller, the camber is positive (+).

    8. If the results of the measurements taken do not fall into the following specifications, it will then be necessary to change the rear axle housing.

    Tape Measure Specifications
    • Camber: -1/16" to +3/32"
    • Toe-out: 0" to 1/4"

WARRANTY STATUS: INFORMATION ONLY

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