(Shortest usable length with 2" of minimum spline is 25.75"). Flanged 28 spline axle has 3.15" tapered bearing installed. Big bearing 9" Ford Axle with 2.5" brake spacing. 4 bolt axle retainers included; new style big ford (torino) with. 375" (3/8") bolt holes or Old Style Big ford with. 500" (1/2") bolt holes.