This high-quality 43T Spiral Main Diff Gear is the perfect part to carry in your RC tool box.Features:Machined from tough steel for long-lasting durability and consistent performance - Spiral-cut, wide tooth profile increases torque handling capabilities  - Precision manufactured gear teeth for smooth operation in extreme RC conditions - GP4 configuration to be used with GP4 Main Input Gear - Fits on 29mm Diff CaseIncludes:1 x Main Diff Gear 43T Spiral GP4 5mmRequires:To be used with #ARA310979. Requires 29mm diff case (ARA310983 or ARA311061)