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A 99 Highlander has IRS, Independent Rear Suspention. Your going to have to completely re-do the rear suspention of the Highlander to put a solid axle with a locker under it.
Looking at you avatar, looks like a 4runner.
If you swap the entire housing, you can either run the a stock wiring harness for the diff and have it work as it would if it came stock. MY suggestion would be to make your own harness so that you can lock it whenever you wanted. (not only in 4L)
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