Ford AC clutch pulley kit FR3Z-19V649-D required when installing superchargers systems that use the 1st shive belt system (AC belt), such as:

• VMP TVS supercharger kits, 2.3 L & 2.65 L
• Roush superchargers kits, 2.3 L / R2300
• Predator swaps

In mid 2014 Ford switched from a 6-rib AC belt to a 4-rib on the F-150 version of the Coyote engine. All trucks with the 4-rib will need to convert to stock 6-rib with this part and an OEM balancer (FRD-NR3Z-6312-A). Fits OEM AC compressor through 2017, see related items for 18+ AC compressor pulley.