Ford 9 inch housing measures 56 inches.   Overall length is 61 inches. 31 spline axles, one axle is resplined, which has never been used. Axles lengths are 27 13/16 and 31 7/8 .  New style housing ends were jig welded.  Big bearing  5x4 1/2 bolt pattern.  Was made up for a 71-73 Mustang project, needs spring perches welded on.