The Dana 50 axle being upgraded from had been previously fitted with an ARB Air Locker. Despite breaking the pinion and damaging the ring gear, the 50’s ARB was in perfect shape. Given the lockers flawless track record over the past 45,000 miles and numerous wheeling adventures, the trucks owner opted to install a 35-spline version of the ARB Air Locker in the 60. The selectable locker is an excellent fit for the long and heavy workhorse. The ability to act as an open diff provides increased maneuverability and makes using four-wheel drive a bit safer in harsh winter weather conditions.