2003 GMC C4500 Topkick Engine: 8.1L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;. 2009 GMC C4500 Topkick Engine: 6.6L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;. 2009 GMC C4500 Topkick Engine: 8.1L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;.
