1996 GMC C3500 Engine: 5.7L V8; Reverse Rotation; Standard Duty Thermal Fan Clutch; w/o A/C;. 1997 GMC C3500 Engine: 5.7L V8; Reverse Rotation; Standard Duty Thermal Fan Clutch; w/o A/C;. 1998 GMC C3500 Engine: 5.7L V8; Reverse Rotation; Standard Duty Thermal Fan Clutch; w/o A/C;.