Part Type: Engine Cooling Fan Clutch. Manufacturer: Four Seasons. 1988 GMC V3500 Engine: 5.7L V8; Counter Clockwise; Optional Duty Thermal Fan Clutch; Fan Mounting Holes are 10 mm.;. 1988 GMC V3500 Engine: 7.4L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch; Fan Mounting Holes are 10 mm.;.
