Carl is a local boy. Well, local to WA anyway. Yes, he does some very cool stuff with diff's. That is definitely a good read with a TON of good tech. You thinking of putting one of his setups in your new ton build sleeps? The grind work is minimal by the sounds of things. Looks like you could have a very stout setup for relatively cheap overall on your build.
Best of Luck,
Mike
Best of Luck,
Mike