I don't know where your rear axle is now but I beleave it to be below or under your rear leaf springs. To lower the rear put the axle on top of the springs. Don't turn it over that won't work you have to take the perches off the top of the axle and put them on the bottom. A lot happens when this is done so get it right your shocks will be different also. Watch your pinion angle. The IFS maybe could be done by putting in a sub-frame??? I'm not sure about your trucks frame.