A series of measurements were taken. Points were measured from each edge of the crossmember to various like points on each side of the frame followed by cross
measurements to the same points. This measurement was to the rear bolt of the tranny crossmember. Luckily for us, each measurement was exact from the first one to the last. If this crossmember was off even an eighth of an inch, it would cause the truck to "dog leg" down the road. That means the rear of the truck would always be trying to change lanes and pass you up on the freeway.