1997 GMC K2500 Suburban Engine: 6.5L V8; Reverse Rotation; Severe Duty Thermal Fan Clutch;. 1998 GMC K2500 Suburban Engine: 6.5L V8; Reverse Rotation; Severe Duty Thermal Fan Clutch;. 1999 GMC K2500 Suburban Engine: 6.5L V8; Reverse Rotation; Severe Duty Thermal Fan Clutch; Bolt-On Type; Marked GPC;.
