Introducing the Billet Machined Gearbox Case for the Associated RC10B5M (4-Gear), a premium upgrade designed to elevate the performance and durability of your 1/10 scale radio control model. Specifically engineered for the original (v1) B5M 4-gear model, this gearbox case seamlessly accommodates the Associated #91425 top shaft and 6 x 12 x 4mm bearings, ensuring a perfect fit and smooth operation. The precision billet machining process enhances the strength and rigidity of the case, minimizing flex and maximizing the efficiency of your RC car’s drivetrain. Not only does this upgrade extend the lifespan of your model, but it also adds a touch of elegance with its sleek silver finish. Please note, if you have the revised gearbox, additional components will be necessary for proper installation. Item number C26290SILVER is an essential addition for dedicated RC enthusiasts eager to optimize their vehicle’s performance and reliability, making it a standout choice for those passionate about their hobby.