Introducing the Billet Machined Grey Gearbox Case,a top-tier upgrade for your Associated RC10B5M 4-Gear model. Specifically engineered for the original (v1) B5M 4-gear setup,this gearbox case is designed to deliver exceptional performance and durability,making it an essential addition for dedicated RC racers. It fits perfectly with the Associated #91425 top shaft and 6 x 12 x 4mm bearings,ensuring a seamless integration that enhances your vehicle's capabilities on the track. For those with the revised gearbox,please be aware that additional components will be necessary for proper installation. Identified by Item# C26290GREY,this high-quality part is crafted to provide precision and reliability,allowing you to push your RC car to new heights and achieve outstanding results in every race.Fitment and tipsTip: Storage/carrying accessory. Verify internal dimensions and what you plan to carry.