Spartan Locker for Dana 44 differential with 30 spline axles, includes heavy-duty cross pin shaftFits Dana Spicer 44 with 30 spline axlesMade from 9310 steel for added strengthReplaces the spiders in a standard carrier caseThe Spartan Locker, by USA Standard Gear, provides reliable traction at a low cost. The Spartan locker's design does not use the thrust washers and has a revolutionary spring and pin design that makes installation a snap!