Molded composite engine gear box created from specially-formulated graphite composite material to fit BACKSIDE and FRONT engine position of XB2. The graphite molded gear box is lighter and more powerful. All parts fit completely together, together with super-easy use of the rear differential is supposed to be appreciated by every racer. The durable gear box houses the differential and rear transmission, permits the mounting of back roll center owner, engine dish, and back shock tower. Fits only XB220