1997 GMC C3500 Engine: 6.5L V8; Reverse Rotation|Severe Duty Thermal Fan Clutch;. 1998 GMC C3500 Engine: 6.5L V8; Reverse Rotation|Severe Duty Thermal Fan Clutch;. 1999 GMC C3500 Engine: 6.5L V8; Reverse Rotation|Severe Duty Thermal Fan Clutch|Bolt-On Type|Marked GPC;.