I would like to re-open this discussion here,Yeah Detroit locker rear. Detroit Truetrac front. A Superduty like that would be nearly unstoppable for anywhere a superduty has any practical right going.
The ARB is open, or locked solid. Controleed by a switch on the dash.
The Detroit is allways locked while driving straight. But when you enter a turn the faster spinning outside wheel can automaticly ratchet free. When you apply alot of throttle that ratcheting may not occur, friction holds the dif locked, and stomping on the gas while turning will spin the inside tire, lock the diff, then spin both tires and send you spinning out of control. Some prudence and self control is required in snow and ice.
Nascar runs Detroit lockers. So do a few of us with Mustangs. Allthough I still prefer a extremely tightly shimmed stock LSD diff in my '04 Mach1.
So sometimes the Detroit is much easier to turn off road than a locked or unlocked ARB. And the Detroit can be handly to reduce wheelspin hauling loads in 2wd up gravel roads or sandy dry pavement where you wouldn't normally engage the ARB or 4wd.
Basicly the detroit is very much like two Craftsman ratchets taped side by side together by the handles. The sockets are your tires, the handles are you power input form the driveshaft. If one of the sockets starts spinning faster than you turn the handles, then that side starts to ratchet free. Eaton has a nice Youtube vid on how the Detroit works.
Every once in a while it'll also windup and unlock bang in a parking lot. Sounds like your axle expoded. Usually it just clicks though.
I have a 2012 Ford Expedition, is the combination you mentioned is still up to date or did you find something better?
What is the gear ratio of my car ? is it 9.75" or 8.8" ?
What part number is the correct one for me and where to find it?