Spartan Locker for Dana 35 with 27 spline axles (1.560 Bore is for 94 and newer Dana 35's). 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.