1977-PREVIOUS F350, F250 snowfighter: low pinion dana 60, very weak.....
1978-1979 F350, F250 snowfighter: high pinion dana 60, kingpins, 35 spline outters, 30 spline inners, internally splined lockout hubs
1980-1985 F350/F250: high pinion TTB dana 50
1986-1991 F350: solid high pinion dana 60, king pins, 35 spline outers, 30 spline inners, internally splined lockout hubs, different spring spacing that 78/79 axle
1986-1989 F250: TTB dana 44HD/ TTB dana 50, both high pinion
1991-1997 F350: solid dana 50/solid dana 60, 50 hase smaller ring gear and axle shafts than 60
1990-1997 F250: TTB dana 50, high pinion
1999-2008 F250: solid dana 60, solid dana 50, both high pinion, metric pattern
1999-2008 F350: solid dana 60, high pinion, metric pattern
MIght want to make sure it is not a TTB front.
