Flanged 28 spline axle axles have 3.15" bearings installed. The back of the housing will be centered between the axle flanges. axles have three bolt patterns in all axles, 5 x 4.5" small ford, 5 x 4.75" GM and 5 x 5".
56" Centered Housing Ford 9 Inch Hump Back Housing with New Style Big Ford Ends
56" Centered Housing Ford 9 Inch Hump Back Kit with 31 spline axles & hdw
56" Centered Pinion Ford 9 Inch Hump Back Housing with Big Ford New Style Ends
56" Centered Pinion Ford 9 Inch Hump Back Kit with 31 spline axles & hdw
56" Centered Pinion Ford 9 Inch Hump Back Kit with 28 spline axles & hdw
56" track width Ford 9" Round Back Centered Pinion Housing Kit w/31 spline axles