GM Service Manual Online
For 1990-2009 cars only

Condition

Action

Using equipment like snow plows for which the frame was not designed.

Straighten and reinforce the frame. Refer to Frame Straightening Description .

A collision involving the vehicle.

A fire involving the vehicle.

Abrupt changes in section modulus.

Improper body, or accessory mounting, which may include the following:

    â€¢ Holes drilled in the flange of the frame rail.
    â€¢ Too many holes in the web section of the rail.
    â€¢ Holes in the web section which are too close to each other.
    â€¢ Four or more holes in the same vertical line of the rail web.
    â€¢ Welds on the flange, particularly across the flange or along its edge.
    â€¢ Cutting holes in the rail with a torch.
    â€¢ Cutting notches anywhere on the rails.