Ford changed to a 4-rib AC pulley on 2014+ F150 trucks. This kit is required when installing a VMP supercharger kit on a truck with a 4-rib belt system.
Option on 11-14 VMP F150 SC kits
Standard on 15-17 VMP F150 SC kits
Includes new Ford AC clutch and new Ford Coyote 5.0L balancer.