To get rid of the whine, I'd suggest that you put in a power steering cooler. While doing so, flush all the old fluid out and fill with the proper ford spec'd fluid (Mercon IV ATF). Install the cooler on the return line to the pump. This will help the fluid stay cooler and last a lot longer. Your fluid is probably ready to be changed if it's gotten hot a few good times anyhow...
I did this way before I did any suspension stuff to my truck, and I would do it again in a heartbeat. I've had no problems from it either, even in -38*C.
I'm with everyone else too about the stabilizer, I've had one in my garage since I got my 4" suspension lift. Never put it in. After I had replaced all the needed joints/bushings on the truck, it didn't need it. Remember too, that the wider the tire, the more it will want to follow the road/ruts and it will act like it's wandering. Be sure your parts are in good condition and the alignment is setup really well.