Part Type: Accessory Drive Belt Tensioner Assembly. DriveAlign Automatic Belt Drive Tensioner. Belt Tensioner. 2001 GMC Yukon XL 2500 Engine: 8.1L V8 GAS; Position: Air Conditioning;. 2002 GMC Yukon XL 2500 Engine: 8.1L V8 GAS; Position: Air Conditioning;.