【Compatible with】:The Steel 37T Main Gear & Differential Case & Input Gear 13T Upgrades Part for 1/10 Granite 3S BLX 4X4 &Mega550; 1/10 Senton 3S BLX 4X4 &Mega550; 1/10 Vorteks 3S BLX 4X4; 1/10 Big Rock 3S BLX 4x4; 1/10 Kraton 4S BXL 4X4, 1/10 Outcast 4S BLX; 1/8 Typhon 3S BLX&&Mega550; 1/8 Vendetta 3s blx; 1/8 Infraction 3s blx& Meag570. Replace #AR310872,ARAC4022 【Differential Case Set】: The upgrades part is durable enough.Precision CNC machined,Anodized 6061-T6 aluminum for lightweight and durable performance. 【 37T Main Gear & 13T Input Gear】Made of harder Steel, not easy to damage, which is stronger, more stable, wear-resistant, environmentally friendly and has a long service life. 【Easy to Install】:The Hops Up Upgrades Set can be directly installed, do need any modification. It is designed to allow more smooth rotation and strength! Providing unmatched driving versatility. 【Tips】:In order to make the product more stable and make the screws not easily separated from the upgraded accessories, please stick screw glue on any metal-to-metal connection. Especially the position of various screw holes. Rcarmumb Upgrades Part for 1/10 Granite/Senton/Vorteks/Big Rock 3S BLX,1/10 Outcast/Kraton 4S BLX 4X4,1/8 Vendetta/Typhon 3s blx，Steel 37T Main Gear & Differential Case & Input Gear 13T,Black