Parts Geek - For 1966 GMC PB25 Series Fan Clutch 74978YKWK 4.1L 6 Cyl. 1966 GMC PB25 Series 4.1L 6 Cyl. Notes: Fan Clutch -- Standard Rotation; Standard Duty Thermal Fan Clutch. Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table.
