I think I've got a pair of D28 hubs, but there is some question if you actually have a "Dana 28" axle and if so which one...
What year is your truck?, because the "True" Dana 28 was only made from 1983-the early part of the 1990 model run (11-89 actually)
The later Dana 28 is the front diff that many refer to as the D28/35 "Hybred"
which while Dana and Ford refer to it as a "dana 28" only the innermost shafts and the differential itself are the smaller dana 28 pieces, the outer pieces are all identical to a
This often creates confusion with auto parts suppliers when you attempt to buy Brake rotors, wheel bearings etc...