DJM offers 3" dream beams for the front and a shackle and hanger kit for the rear. It's a 3/5 drop. A flip kit( if anyone actually made one) with net you 9"+ of drop. The axle bottomed out on the frame at 9", it would have gone further. If you drop it that far you will have to do a notch in the frame and there goes your towing capacity.
I did the DJM's in the front, built me own filp kit in the rear using 4" ProComp lift springs. It gave me about 6.5 in the rear and was a lot easier than grinding and drilling all those damn rivets.
Here it is before I dropped it.
Only problem I've had is the offset of the wheels. 5.25" backspacing isn't enough to completely tuck under and it catches the fender lip just a hair. I have yet to roll the lip, but that will fix it.