Frame Reference Point Description

Whenever possible, make judgements and conclusions based on measurement. Measure the wheel alignments so as to prevent any future trouble like unsymmetrical wear of the tires or catching of the steering wheel.

• If there are any deviations, use a tram tracking gauge and measure parts of the body (a).
• If there is any twisting to the body, measure using a frame centering gauge (b).

  Specifications

  • Pointer B - Short pointer height adjustment 15-290 mm (0.59-11.42 in)
  • Pointer B - Long pointer height adjustment 185-450 mm (7.28-17.72 in)
• When measuring body dimensions, use a universal tram gauge (c).

Fig 1: Identifying Frame Measuring Tools

Courtesy of GENERAL MOTORS CORP.