Further strengthened with double-width welds, the Nine Inch Factory housings feature a 360 degree inner mounting flange for third member reinforcement. As with all The Nine Inch Factory housings, the new Extreme Duty unit can be ordered as a traditional 9-inch stepback or roundback. You can order a bare housing center, housing and axle package, or a complete rear assembly with your choice of limited-slip, posi-traction, Detroit Locker, or spool. There are also a variety of disc and drum brake options. The rears all come with 31- or 35-spline axles and big bearings. Contact: John’s Industries, 100 Axle Drive, Caspian, MI 49915; 800-332-3450; www.9inchfactory.com.