Proper alignment of housing ends is obtained with a 1-11/16" ground shaft which uses screw on axle adapter ends. Includes carrier bearing adapters for Ford 9", Dana 60, Chevy 12 bolt, Mopar 8-3/4" and Early Olds rear ends. Kit is complete with housing end adapters for Mopar, Early Olds, Big Ford, Mustang, Camaro, and Impala rear ends. It also includes a taper end to align the housing tube. We include our custom rear end worksheet to make measuring and narrowing your rear end easy. This jig can be used to install a 40-spline Strange spool with the optionally available adapter (part no. 6709).