Find a GM 14 bolt instead. The D60s come with 1.31" shafts...the same size as D44s. The Spindle is 1.400", and to accomodate 1.5" 35 spline shats, it needs to be bored out to ~1.600. Which is easier said then done. The spindles are welded to the axle, so you have to find a machine shop that can bore it out, or you have to cut the spindles off and have them bored and rewelded. If you go straight to a full float 14 bolt, you get 1.5" shafts, and a 10.5" ring gear. The carrier is a 2 piece design, so detroit lockers are about $400. And the re-gearing sounds much easier too. No carrier shims to worry about!