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The ACT XACT Pro-Mass flywheel for 2012–2018 Jeep Wrangler JK is a heavier, inertia-optimized flywheel that improves climbing and pulling capability without an excessive weight penalty. Its mass distribution is engineered to increase inertia where needed while minimizing added weight; the unit is sold weight-matched and can be resurfaced when required, supporting durability in high-load applications.
ACT 12-18 Jeep Wrangler JK XACT Flywheel ProMass
