Underbody Misalignment Check

Underbody Misalignment Check

NOTE:
- Underbody misalignment can be the result of damage or loose frame components. It can affect front and rear wheel alignment and cause incorrect operation and abnormal wear of tires and chassis parts.
- Refer to the Ford Trucks Body Builders Layout Book for dimensional data when carrying out repairs on the cab or frame.

1. Inspect the frame for damage and loose parts before checking the frame alignment.

2. Inspect all crossmembers for cracks, twists or bends.
- Inspect all of the welded connections for cracks. For repairs, refer to Weld Attachments.
- Check all of the support brackets for looseness. If the brackets are loose, tighten to specification.

Diagonal or X-Frame Checking Method

1. Refer to Rotunda Laser Measuring System operating instructions for diagonal or X-frame checking.