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Flat Out Engineering recommends moving the front axle centerline 1 to 2 inches forward from the stock centerline depending on the wheel and tire diameter used. If the cab is still mounted on the frame, hang the front sheetmetal and mock-up the wheel and tire combo to determine the proper front-axle centerline location. Mark this location on the framerail. Mike moved the centerline forward 1 1/2 inches.