The front TTB axle should be a Dana 50 ( VERY similar in strength to a 44 ) but they have hubs and brakes of a Dana 60 .
The rear should not be a Sterling 10.25 ( they came in service around 1985/1986 or so ) but a Dana axle ( check the B.O.M. to be sure ) . If the rear axle is a Dana 60 it just might be a factory rear 35 spline set up -so check it out .
HTH , Tom
Note : Ford , for some reason , used some strange axle set ups in the mid eighty's so becareful - some F-250's came with S/F C-clip rear 60's and small hub 44's up front .
If you take some good pictures of the chunks and hubs it will be fairly easy to see what it has .