Use a measuring tram gauge in order to accurately determine the alignment of the underbody. Use a tram gauge set which includes a vertical pointer capable of reaching 914 mm (36 inches).
Tram gauges measure the following 2 types of measurements:
| • | Direct point-to-point measurements |
| • | Datum line measurements |
Datum line measurements are measurements calculated on a horizontal plane parallel to the underbody.
Point-to-point measurements are generally taken on the front structure steering and suspension components. Point-to-point measurements require equally-set vertical pointers. In some cases, take point-to-point measurements with a tape measure or appropriate measuring tool, as needed.
Dimensions-to-gauge holes are measured to the leading edge or center of the holes and flush to the adjacent surface metal. Refer to Dimensions - Body or Measurements - Underbody .
