I cant' help with the cracking situation but if you are thinking of buying a MUX don't do it if you plan to do offroading!
I have driven one offroad and the traction control system was rubbish - even with 4WD selected on the little knob of evil, the power wasn't being split properly and all power disappeared out one diff...
I read that you have to know a super secret way of controlling the throttle to get the traction control to work properly in some situations. It was something along the line of: when you lose traction you have to keep the throttle steady for a period of time so the computer knows that traction is being lost and will divert it to other wheels.
So I presume when you get bogged with one diff you have to sit there spinning the wheels digging yourself in deeper before the computer realizes it's bogged...
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