I'm sure this has been posted at some time or another but me and the search were not getting along with each other.

I have a 92 f150 2 wheel drive that I would like to swap a f250 rear end into so I can sleep better at nite about heavy loads. I frequently haul, short distances, very heavy loads some times upwards of 4k pounds! I have a set of 5K lb air bags on it and with them set at near there max psi ~95 I still had the truck squatting a few times and the stock 15" rims offer me no tire options for any thing over ~2300 lbs plus the fact the f150 rear end is not rated for that kind of weight so...

what do I need to install a f250 rear into my truck? what years will fit? whats this I hear about a vss in the rear? if a f150 has it in 92 does that mean the f250 has it too? will the stock drive shaft still work? I don't need a howto pretty much just a parts list

thanks