Collection: Auto - Manual Trans Main Shaft

Restore structural integrity and smooth torque delivery to your drivetrain with our selection of Auto Manual Trans Main Shaft components. At DIY Customs, we provide high-strength replacement main shafts, durable main shaft bearings and adapters, specialized main shaft nuts, and heavy-duty spacers designed for a perfect fit. Whether you are replacing a snapped main shaft after a high-load failure, upgrading internal transmission components for a performance build, or performing a detailed gearbox overhaul with new washers and retainers, our professional-grade hardware offers the mechanical precision and surface durability you need at unbeatable prices. From specialized bearing retainers to direct-fit main shafts for popular Tremec, NV4500, and T-5 transmissions, we carry the essential gear for every manual gearbox. Don't see the specific spline count, shaft length, or specialized internal part for your transmission? Hit the live chat or call 412-882-8346—we can special order and drop-ship exactly what you are looking for directly to your doorstep!