"NO SPIN/DETROIT LOCKER/LOCKING DIFFERENTIAL; KEEPS WHEELS LOCKED TOGETHER EXCEPT DURING TURNS SO THAT TOGETHER L AND R WHEELS ALWAYS HAVE MAX GROUND TRACTION; ALLOWS DIFFERENT WHEEL SPEED IN A TURN BY DISCONNECTING USUALLY THE OUTSIDE, FASTER MOVING WHEEL AND DRIVING THE VEHICLE W/THE INSIDE WHEEL; AXEL SHAFT DIA 1.240 IN; 24 SPLINE; RING GEAR PINION RATIO 3.54"