Redesigned super-strong BACKSIDE bulkheads are narrower to maneuver the arms more into centerline to create more traction also to offer a larger range of track width adjustment. The bulkheads have actually a fantastic fit towards updated differential and they are reinforced to increase the reliability. The XB4 bulkheads allow super-fast & easy diff trade and servicing by dismounting just 4 screws from the front side associated with the bulkhead and base associated with the chassis. This super-fast diff access can be acquired at both front & rear. The bulkheads have actually minimized ball-bearing play, leading to increased gear teeth lifespan and minimized gear stripping.