This is a 2001 Ford F-350 solid axle dana 50. It is 69.5" wms to wms. 8x170mm bolt pattern, 30 spline outers 35 spline inners. It's got a 9" ring gear compared to the 9.75" D60. Complete from hub to hub (missing external lockouts). Asking $600 OBO. Call or text if interested. 801-232-4291