Yes, without a front diff locker, if you have one of your front wheels with little traction and the other with good traction the low traction wheel will spin and the good traction wheel will not, exactly the same as a car or truck.
Well i don't know if anyone else has done this but on my 350 when I installed new bearings in the front diff i installed the clutch pack springs backwards. I'm yet to see only one wheel spin. Both wheels pull and the front tires are wearing as a result of it i'm sure. Thinking about doing this to the front diff on the 400. Also having good brakes on the front helps. Applying the front brakes causes both wheels to pull so i'm told. Other than that you'd have to get a DGL.
It should pull a little, the wheel with the least resistance is the one that is going to pull which is usually the one up in the air. It has clutch disc and spring washers in it which can wear out over time. As ALLHonda said there are a few things that can be done to it to help it pull more, but it also wears some of the moving parts out quicker.
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