2007 GMC Sierra 1500 Classic Engine: 4.8L V8; Reverse Rotation; Optional Duty Thermal Fan Clutch;. 2007 GMC Sierra 1500 Classic Engine: 5.3L V8; Reverse Rotation; Optional Duty Thermal Fan Clutch;. 2007 GMC Sierra 1500 Classic Engine: 6.0L V8; Reverse Rotation; Severe Duty Thermal Fan Clutch;.
