I finally had a chance to take the Muggy out for a spin yesterday. Apparently 50K in the center diff isn't enough. (See pics)
On 4s it was fun and on 6s...well....time to glue the front tires on again. If I hit WOT at any speed it would just lift the front end and blow the tires off.
I'm going to try 30K in the front diff and maybe add some preload to the rear shocks. I'm hope to try and keep the front end down.