Dana 60 front ends don't use the regular known warner lock out hubs, one of my trucks with the Dana 60 has "Selectro" hubs and the other has "Dualomatic" lock out hubs. Ther are just a different type of lock out hub. They have a big "knob" that sticks out that you turn to lock or unlock the front end! Heavy Duty. Check the driveshaft to the front end for bad bearings and too much spline play. Also check the rear diff. I have had two Crew Cabs where the pinion bearings have been loose on the rear Dana
60's.
I now see why you have a need for for a truck, so I might think about a truck instead of an "A" body.