Part Type: Engine Cooling Fan Clutch. Reverse Rotation Severe Duty Thermal Fan Clutch. Fan Clutch. 1987 GMC G3500 Engine: 4.3L V6; Counter Clockwise; Optional Duty Thermal Fan Clutch;. 1987-1988 GMC G3500 Engine: 5.7L V8; Counter Clockwise; Optional Duty Thermal Fan Clutch; Fan Mounting Holes are 10 mm.;.
