Left.3/4 & 1 TON. Right.3/4 & 1 TON. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Axle Shaft Bearing. Axle Nut. Dual Rear Wheels. Exc.Ring Gear 9.75". Ring Gear 10.50". Single Rear Wheels. Adjust. Drive Shaft. Inner. Spindle.