1998 GMC W4500 Forward Engine: 5.7L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;. 2008 GMC W4500 Forward Engine: 6.0L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;. 1999 GMC W4500 Forward Engine: 5.7L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;.
