For the 4C, The Wavetrac™ Helical type differential is a very nice option. This unit is Made in USA and offers some unique features.

Proprietary torque sensing operation splits power to ensure traction improvements and better grip, and the 9210 steel alloy gears and hardened case, combined with ARP brand fasteners finish off the package, ensuring durability so won’t need to quickly re-open the 4C gearbox to service it.

In stock now, our special launch price does include shipping to USA lower 48 states*