OK Guys I got it... There are problems with ARBs...

In fact, this is what my Gear Guys says...

The front diff on an Xterra (R180) is the old Z rear end. My Gear Guy refered to it at the Rubics Cube of diffs... real hard to work on. But, and this is a big butt, combine difficult diff and complex ARB and you have a real nightmare... lots of points of failure.

My Gear Guy called Powerlock (LockRight) and they said there "may" be a rear locker (C200 diff) this Fall for the X, but none for the front.

But, and this is another big butt... My Gear Guy says, "Wait." Xterra 4X4's are selling like crazy and the market will come to us. This time next year there may be as many as three lockers for the X.

So I will put my money in an interest bearing account and wait.

Thanks to all, and continue to dream of piles of rocks and sand.

Doc