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