to measure for squareness.. measure end to end on both frame rails, and then from the spring hangers on one side to the spring hangers on the other side (measure in an X)..
my frame is bent just a touch, the right side frame rail is 1/8 of an inch shorter than the left side.
When i installed my IFS, i split the difference by 1/16 of an inch,,, the truck drives straight down the road, doesnt wander or pull..
