Machined from heat-treated domestic materials, our Steel Sprague and Armature plate combo is designed to handle the most extreme applications. This combo is “Bomb Proof”. After years of collaboration with the industry’s leading innovators, we have been able to emphasize and drastically improve every aspect of engagement surface area while in 4WD.Our BOMBPROOF Front Differential rebuild package includes the upgraded 12 Tooth Pre Heated 4130 Steel Sprague cage, 12 Tooth 4130 Armature plate, Upgraded bearings & seals w/ solid gear pin. A set of Tall Rollers is also included. This Rebuild eliminates all of the plastic OEM parts and upgrades all of the internals. Are having Four Wheel Drive engagement issues? Are stuck in 4WD or cannot get into 4WD? Our Front Differential Rebuild is a must needed upgrade over the stock components. However, there’s a few front differentials that need a little extra TLC with 4WD. Send your front diff to us and our certified tech will troubleshoot and correct the noise. This price includes installing our upgraded bearing kit, custom shims to set the lash on the ring and pinion gears and also bench load test your diff before we ship it back.