HP were never in a rear application, only in a front, only came in fords
78-79 some f-250's and 350's HP king pin 60
1980-1997 F250s used either the Dana 44HD TTB or the Dana 50 front axle, depending upon packages, options, GVW, etc
1980-1985.5 F350s used the dana 50 TTB front axle.
1985.5-1997 F350s used the HP Dana 60 Monobeam front axle, kinpins initially, switching to Balljoints somewhere around 1992.
1999-2001 Super Duty SRW F250/F350s used the Dana 50 front axle, Balljoint, Unit bearings
1999-current F350-F550 DRW use the Dana 60 front axle, again, balljoint, unit bearings
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