Redesigned super-strong BACKSIDE bulkheads are narrower to get the hands more into centerline generate more traction as well as provide a much more significant choice of track width modification. The bulkheads have really the truth is an excellent fit towards updated differential and maybe they've been strengthened to enhance the reliability. The XB4 bulkheads allow super-fast & easy diff trade and servicing by dismounting simply 4 screws through front component from bulkhead and base through the framework. This super-fast diff access are had at both front & back. The bulkheads have actually actually minimized ball-bearing play, causing increased gear teeth lifespan and minimized gear stripping.