I would open the diff, clean it really well and put new oil in it with LSD additive.
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BellTech 963SP / InTune / Volant / Fastman / Magnaflow / Moroso AOS / 180 T-Stat / Mech Fan Delete & V-6 E-Fan / Amsoil
14.574 @ 97.82 3.21 gears, full street trim, 5120 pounds on the scale!!!
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