None that I have seen so far.... but I was under my Nitro this afternoon and was amazed at how easy it would be to drop it 1 or 2"
The front has what looks to me like a clevis fork at the bottom end of the strut. It's long too. If a shorter one were fabricated it would drop the front end. It's about half way from the a-arm fulcrum to spindle so a .75" shorter fork would result in a 1.5" drop which I think would be perfect.
Going the route of a shorter fork in front would mean the stock strut could still be used.
The rear is as simple as new springs and shocks.