im starting the rear of the truck, got the bed off and took measurments...my rear axle is 1 inch off on the pass side from the driver side.... I measured from the rear of the frame to center of axle, from rear cab mount to center of axle, from cab rear to center, all are 1 inch exactly different....not sure which one to use???? anyone have any info on the frame specs? or if anyone can putt a rear frame to axle measurment...