no way at all with that sixty
The problem with the full float sixty hub is that the bolt pattern where the shaft bolts to the hub is that it is 4" across there. That is too big to machine down and fit the six lug pattern. You have two choices to achieve the 6 lug patter:
1) use the 14 bolt dually wheel hubs. They are only 3.5" across and you can machine the hub down and redrill the hub to take the 6 lug patter. You also have to modify the sixty and put the fourteen bolt spindles on there.
or
2) go to a semi-float rear using something like the wagoneer drum brakes. You would have to cut the ends of the housing off and weld in a bearing pocket for the new axle shaft.
Kind of a pain huh. We can do it though, I'll PM ya.
ELLIS