YD-2 Aluminum Gear Differential Case Cap Cover YD2 [Yokomo] Z2-503GHC This is made of hard anodized aluminum. It is an aluminum differential case cap for gear differential used in off road car YZ series and drift car YD - 2 series. It has high heat dissipation efficiency compared to standard resin, keeping the temperature change of the oil in the inside, it is possible to keep the viscosity change to the minimum and stabilize the running characteristics. In addition, accuracy improvement improves rotation efficiency and prevents oil leakage, it is possible to extend the maintenance cycle of diff.