* 4.8L V8: This engine produced approximately 300 lb-ft of torque.
* 5.3L V8: This engine produced approximately 320 lb-ft of torque.
* 6.2L V8: (Less common in the 2009 model year) This engine produced significantly more torque, around 403 lb-ft.
To find out which engine is in *your* 2009 GMC Yukon, check your vehicle's documentation (owner's manual) or the sticker located in the driver's side doorjamb. The engine details will be listed there.