A misaligned frame may move up or down or to the side of where the rail should be. These possibilities must be checked.
The easiest way to check body alignment is with tramming gauges and universal measuring systems made for this purpose. Detailed instructions are normally supplied at the time of purchase. Instructions for equipment usage are not given in this manual.
Whether alignment is checked with or without gauges, the vehicle must be parked on a level section of floor. Certain conditions call for preliminary inspections before actually inspecting the frame. Suspension problems may make it appear that the vehicle frame is out of alignment. A weak spring may make the vehicle appear to have a twisted frame.
A visual inspection of the top and the bottom flanges of each rail may reveal the specific are where sag or buckle exists. In the case of sag, wrinkles may appear on the top of the upper flange. Wrinkles on the bottom of the lower flange are definite evidence of buckle. To inspect the frame to body alignment perform the following:
- Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
- Inspect the suspension for worn or damaged components.
- Inspect for floor pan for damage.
- Inspect for frame damage.
- If the frame can not be re-aligned, replacement may be necessary.
Inspect the frame to body alignment by inserting a 19 mm (0.75 in) diameter guide pin or drill bit into the frame to body bolt holes.
