This is the debut of the new Dynatrac standard-cut semi-float ProRock XD60 rear axle; it was not even shown at the 2017 SEMA Show. The choice was a no-brainer because it’s made in the USA (like all Dynatrac axles), and it matches the track width of the front ProRock 44 axle. The new XD60 uses a 10.2-inch ring gear and larger differential than old-style Dana 60s, and 35-spline shafts featuring a proprietary heat-treat for maximum twist resistance. The standard-cut (low pinion) design is the strongest design for rear-axle applications, and it is available with the 5x5 JK lug pattern to allow a broad field of wheel choices. It carries a 5.13-ratio Auburn Gear ECTED Max electric locker (made from 9310 heat-treated billet steel) that offers limited-slip and fully locked modes. Hoses and fittings from Earl’s Performance Plumbing were used to vent both axles, and if you noticed that red rear bumpstop, it’s part of our extensive use of Energy Suspension’s polyurethane products such as a full body mount replacement kit to help refresh our Jp Week to Wheelin’ JK.