The rear bulkheads feature a split design, allowing the rear suspension to be mounted to separate bulkheads, while the center layshaft sits on its own, super-narrow bulkheads which are positioned closer to the center of the chassis. The split design of the bulkheads also enables super-easy access to front and rear differentials and the middle layshaft. Exchanging diffs and spur gear has never been quicker or easier.