Treal Hobby Traxxas TRX-4M CNC Aluminum Transmission Gearbox. The Transmission Case is engineered to provide unparalleled durability, ensuring long-lasting performance under the toughest conditions. Crafted from high-quality 7075 aluminum that can withstand harsh punishment and keep your gears secure, offering peace of mind to RC enthusiasts. In addition, they are available in a variety of anodized colors, allowing you to personalize your TRX-4M appearance!