Original Name / Part No.: AR310456+AR310431Part location: Rear CVDProduct major functions & usage: Transferring the power and leading the drive of the rear wheels.Accessories:CVD 2pcsStainless Steel Screw Shaft 5x5 2pcsMajor advantages of upgrading to this part/product :1. Made by harden steel #45 for stronger use and smooth driving performance.2. The thicker design upgraded from original dogbone 5mm diameter to 6mm diameter makes the movement of turn more powerful and not easy to break.