For Dana 30 Dana 30 Differential 27 Spline Count (SL D30-27) Spartan Locker

Spartan Locker for Dana 30 Dana 30 Differential 27 Spline Count (SL D30-27). Function: When driving in a straight line, the locker will lock the axles together, similar to a spool. However, when the wheels need to be differentiated during a turn, the locker will allow the outer wheels to rotate faster to complete the turn.