Hey; no problem. We determined that there was too much play in the drivetrain for the calibration to take successfully. You must have the brakes locked up (but not the inching pedal) and when it calibrates the driveline shouldnt move. However theres enough slop that it cause the calibration to mis read. So we told the customer (who recently purchased the truck from a used dealer) to send it back immediately. It had some serious internal issues.