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It's tough to tell, but it really looks like your front QD system is working in the second video you posted. In the last video, yes, it looks like that's about the right amount of wheel slip before the QD system kicks in. I had my QD WJ out just last weekend and definitely engaged QD on a few blue trails. It's a cool feeling when the clutches engage and you just start moving forward.

From what I've read (and I've read a lot), the QD system loses effectiveness once you go higher than 32" tires. You're pretty much right on target with your 255/75/17's. What happens with bigger tires is the ground is farther away from the axle with a bigger tire so when the ground is holding a wheel steady, it's holding the wheel steady with more force. This is why Greyhound busses have massive steering wheels...less driver fatigue. On one side you have the ground holding the wheel steady at the tread. On the other side you have the friction in the clutch disk system trying to turn the wheel. If the ground is holding the wheel steady with more force than the friction discs can overcome in the diff, the discs will start to spin against each other and this accelerates wear in the QD diff exponentially. It's not a matter of whether the engine has enough power. It definitely does. The engine will keep sending power, but the friction discs will spin before the tire does after you pass a certain tire size.

Did the shop that did your rear diff replace the whole axle? From what I've found, the QD differential is completely non-serviceable and the only way to repair it is to install a whole new carrier. The assembly seems to be about a thousand bucks new. If the shop pitched the QD carrier and put in an open carrier to save money (or a non-QD carrier from a junkyard non-QD WJ), you'd be effectively QD-less in the back. You could, however, have a real locker installed since the non-QD carrier will accept one.
 

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Silver linings my guy! Like I said before, an open D44a axle can accept a REAL mechanical locker which is better than the vari-lock setup. Beyond that, the open D44a's are kinda tough to find since most V8 WJs came with QD, and you (may) already have one! I actually pulled one from a junkyard to fill with Spartan Locker and swap into my WJ. Ideally you want a 242HD t-case also, but if you don't DD it I think you'll be fine using the 247, at least until wheeling it wears the clutches out. Then you find yourself a 242HD.
 
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