Severe service aluminum through-bolt case (3.812" bore), 40-spline lightweight steel spool, steel caps, MW steel 1350 series 35-spline pinion yoke (can be upgraded to 1480), ball / tapered bearing pinion support, 1/2" ring gear bolts, your choice of large pinion 10" 9310 pro gear that has been drawn for drag race applications.
Manufacturer: Mark Williams Enterprises, Inc.