MW Aluminum through-bolt case with steel caps (3.812" bore), lightweight steel spool (40-spline), MW 35-spline 1350 series pinion yoke, ball / tapered bearing pinion support, 1/2" ring gear bolts,  large pinion 9-1/2" 9310 pro gear. Thirdmembers include shipping / storage transporter and 3 quarts of gear lube. (68 lbs)