Redesigned super-strong FRONT bulkheads are narrower to go the hands more into centerline to produce more traction as well as provide a better selection of track width modification. The bulkheads have in fact really a fantastic fit on updated differential plus they are reinforced to boost the dependability. The XB4 bulkheads allow super-fast & effortless diff trade and servicing by dismounting simply 4 screws through front part linked to bulkhead and base related to framework. This super-fast diff access is available at both front & backside. The bulkheads have minimized ball-bearing play, causing increased gear teeth lifespan and minimized gear stripping.