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Grab yourself an M85 differential out of a 02-05 IS300.
3.73 FD as opposed to the stock FT86 being 4.10.
EDIT: Not terribly hard to find, but they aren't plentiful. I bought mine for $575 shipped. It is a *direct* swap. You need to pull the IS300 axle shafts out, and the rest is straight bolt in.
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