Collection: Auto - Manual Transmission

Take control of your drivetrain and restore mechanical precision with our selection of Auto Manual Transmissioncomponents. At DIY Customs, we provide high-strength replacement manual transmission assemblies, comprehensive master rebuild kits, durable gear sets, and heavy-duty synchronizers designed for a perfect fit. Whether you are repairing a high-mileage gearbox with new bearings and seals, upgrading to a performance short-throw shifter, or performing a complete internal overhaul with new cluster gears and shift forks, our professional-grade hardware offers the smooth engagement and durability you need at unbeatable prices. From specialized shift boots and knobs to direct-fit internal components for popular BorgWarner, Tremec, and NV-series transmissions, we carry the essential gear for every manual shift project. Don't see the specific gear ratio, spline count, or specialized transmission part for your build? 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!