Cusco
Cusco Pro-Adjust Kit RS LSD FC3S/FD3S
$3,340.57
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Part price$3,340.57
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✓ Confirmed-fit parts — add your vehicle in your Garage to check fitment.
Pro-Adjust service kit for the Cusco RS plate-type LSD installed in the FC3S or FD3S — includes the shims and springs needed to retune the diff's preload and ramp bias without a full replacement unit.
If your diff is structurally sound but not performing how you want it, this kit lets you dial in engagement feel without pulling the whole unit.