R31 is a Borg-Warner diff.
LSD's of varying from shitbox stock ones through to KAAZ units are easily available, depends on how good you want it to be and how much you want to spend with stockers being anywhere from free and upward to maybe $150 max (more than that and it'd want to be a serviced unit with some new parts) to the KAAZ units for $1400 or thereabouts and upwards.
Mini spools are about $100, full spools about $300 and neither are legal on the road.
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