GM Service Manual Online
For 1990-2009 cars only

Centerline length measurements are 3-dimensional measurements. The 3 dimensions are:

    • Length (distance between 2 points when height is parallel to centerline).
    • Height (measurement is parallel to the datum plane).
    • Width (measurement is parallel to the centerline).

When reading dimension charts, horizontal width and length dimensions of the underbody are shown as viewed from the bottom of the underbody. Vertical dimensions are shown from the side of the underbody and use the datum plane as a base for all vertical (height) measurements.