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.
Better get a new gear guy. Your current one doesn't know squat about the Xterra.
My ARB installer had no problems installing the front and rear lockers.
Rear locker installed 2/01, front installed 7/01. These are easily the best off-roading mod I have made. They are FANTASTIC in dry conditions; only a slight help in slick conditions - mud, ice, etc where tires are the limiting factor.
The only trouble I have had is with breaking the activating pin on the switch face plates. I carry 2 spares now. If you want lockers today, then ARB is your choice - tomorrow - who knows.
The stock ARB installtion includes a compressor with a small built in tank. This works fine. If you want to power air tools or have a larger air tank, then cost and problems are going to escalate. Warmonger is the authority on this.
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