2006 GMC W3500 Forward Engine: 6.0L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;. 2007 GMC W3500 Forward Engine: 6.0L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;. 2008 GMC W3500 Forward Engine: 6.0L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;.
