Spartan Locker for Dana 60 differential with 35 spline axles, includes heavy-duty cross pin shaft Spartan locker for Dana 60 with 35 spline axles, includes heavy-duty cross pin shaft. The Spartan locker by USA standard gear is a mechanical locker that replaces the spiders in a standard case. The Spartan locker's design does not use the thrust washers and has a revolutionary spring and pin design that makes installation a snap! The couplers and drivers are made from 9310 steel, for added strength. Each Spartan locker carries a one year warranty against defect.