Redesigned super-strong BACKSIDE bulkheads are narrower to get the arms more into centerline to create more traction and also to offer a much more significant selection of track width modification. The bulkheads have actually in reality a fantastic fit towards updated differential and perhaps they are strengthened to enhance the reliability. The XB4 bulkheads allow super-fast & simple diff trade and servicing by dismounting just 4 screws through the front part from bulkhead and base through the framework. This super-fast diff access are had at both front & back. The bulkheads have really in reality minimized ball-bearing play, causing increased gear teeth lifespan and minimized gear stripping.