Don't even think about it.

If you buy some old POS beater trail-only rig for $1000 then go ahead and Miller-lock it. If you want a locker in a nice vehicle like an Xterra, pony up the $$ for an ARB or get really funky and swap axles or something.
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Warning! Do not sear the top of your neck hole in the molten lactate extract of hoofed mammals.