XRAY X4 Composite Gear Differential Case. This replacement diff case is precision-molded, and features 38T pulley. The cover is molded from tough composite material, and the case is compatible with the XRAY X4 Gear Differential (XRA309401). Package includes one diff case, and cover.
The diff case features small bleeding holes for the M2.5x8mm screws to allow excess oil to drain out. The shape of the diff case has been updated, for a more centered rear belt position that improves consistency & forward traction.