Auburn Gears NEW MAX Lock Locker is an automatic FULL locker, which fits into the O.E.M. open carrier, giving both 4 Wheel Drives AND 2 Wheel Drives optimized traction all the time, even in the most unforgiving conditions. With enhanced transfer of power to the wheels, rapid reaction to changing road conditions and an elimination of wheel-spin, MAX Lock means confidence. Will fit in the front or rear stock open differentials.