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Mittler Brothers offers a blank layout chart to help with measuring the housing. Since the passenger side is 1 inch shorter than the driver side on our Camaro rearend, this produces a 1⁄2-inch pinion offset, which is common for most GM rearends. The example shown here is for a Ford housing with a 2-inch difference in axle length, creating a 1-inch pinion offset. Clearly, this tool can also be used for narrowing rear-end housings and therefore changing the pinion offset if necessary.