This is a genuine Dana Spicer outer stub axle that fits Ford F250 and F350's with the Dana 60 front differential. This doesn't fit all Fords, so if you aren't sure of the part number you need please email us with your differential tag number. This shaft measures approx. 7" from center of the u-joint to the tip of the axle, is 35 spline and uses the SPL55-3X universal joint. Shipping is FAST and FREE in the continental U.S.