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The locking diff is really useful when you have one tire in the air or on otherwise low traction surface and the other tire has good traction. Locking the diff on ice just causes both tires to lose traction all together and swing the back end around.
a factory limited slip diff might as well be an open diff in most limited traction situations anyways so why not get the locker and at least be able to guarantee both wheels will spin.
At the price of the truck what is a few hundred more. I don't think I will "need" it, but because I am building my own truck, I to thought, for the price may as well have it; just in case I am in a tight spot that calls for it.