no experience doing this but some things to think about:
- axle weight; the D60 is significantly heavier than a 7.5 or 8.8 axle, it might be a bit over kill.
- axle width; D60 was only offered in full width vehicles (IIRC)you will need to either shorten the axle so that the wheels will fit under your fenders, or leave it.
- spring perches; D60 perches will not line up with your springs, you will need to modify them to fit.
- shock tabs; again they will not line up with your truck
- drive shaft - pinion connection; not sure what is required, i don't know if a D60 has a pinion yoke or a flange, either way it won't fit your truck.
- emergency/parking brake connection; you will need to make yours fit with the brakes in the D60.
- gear ratio; you will need the same gear ratio as the front of your truck.
why do you want a full floating rear end on your truck?
do you need the ability to unlock the rear wheels?
the explorer 8.8 swap is plenty strong for most people, it is the correct width, even comes with disk brakes. you just need to weld on new spring perches. (look for a 1995 or newer for disk brakes.)
good luck