Part Type: Engine Cooling Fan Clutch. Reverse Rotation Thermal Heavy Duty Fan Clutch. Fan Clutch. Electronic Clutch?. : Non Electronic. Fan Bolt Circle IN: 3.25 in. Fan Bolt Circle MM: 82.6 mm. 1999 Chevrolet Silverado 1500 Engine: 5.3L V8; Counter Clockwise; Optional Heavy Duty Thermal Fan Clutch;.
