4 Seasons Engine Cooling Fan Clutch For 1987-1991 GMC R3500

Part Type: Engine Cooling Fan Clutch. 1987 GMC R3500 Engine: 4.8L L6; Standard Rotation; Severe Duty Thermal Fan Clutch; w/ A/C;. 1991 GMC R3500 Engine: 5.7L V8; Standard Rotation; Severe Duty Thermal Fan Clutch; Fan Mounting Holes are 5/16 In.;.