1997 GMC W3500 Forward Engine: 5.7L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;. 1998 GMC W3500 Forward Engine: 5.7L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;. 1999 GMC W3500 Forward Engine: 5.7L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;.
