Machined full floating axle housing design with fully welded 3-inch axle tubes. Axle tube diameter compatible with numerous suspension designs. Fully machined 2.5-inch axle tube ends for fitting Grand National hubs. Lightweight steel hubs use 2.5-inch ID tapered bearings for increased loads. Axle housing features centered pinion design for maximum driveshaft clearance. Available in 56, 58, 60, and 62 inch wheel flange to wheel flange measurements. Floating hubs are offered in 5x5 and 5x4.75 wheel bolt patterns with 5/8-11 studs. Includes 31 spline solid axles that fit popular differentials and spools. Housing includes oversized fill and drain plugs for easy fluid changes. NPT threaded axle vent located on main housing. 24-spline drive plates with aluminum axle caps allow easy axle removal. 11.75-inch disc brake rotors, bearings, seals, and hardware included. Only needs disc brake calipers/mounting brackets, and center section to complete. Upgrade To a Full Floater Rear End for Increased Strength and Safety The full floating rear axle has been around for decades. Primarily designed for heavy duty truck use, it was found to be a great solution for circle track racing and has been a race-spec axle housing used in all levels of circle track racing ever since. Today you'll find high horsepower street cars that see extreme cornering g-forces (auto crossing, road racing, etc.) using full floater rear end setups as well. So why the change to a full floating axle from the more conventional semi-floating axle found under just about every rear drive production car made in the last century? It's easy really when you compare the differences between full floating vs semi floating axle assemblies. In a semi-floating axle, such as the popular GM 10 and 12 bolt rears, orCompatible with Ford's 7.5- and 8.8-inch rear ends, the axle assembly is retained by a C-clip at the differential end and rides on a single bearing seated in the end of the axle tube