I can not find anywhere that states definitively what the towing capacity of this truck is. I have found that the '04-'08 can tow up to 9,500lbs with the 5.4 and a 4 speed auto. This thing has approx 10hp more and same tq but the 6 speed auto has to do something for towing.
*** Just some peice of mind for us Ford guys- the max towing capacity for the:
F150 '04-'08- 9,500 (5.4L Triton V8)
Tundra- 10,500 (5.7L iForce V8)
Titan- 9,400 (5.6L V8)
Silverado 1500- 8,900 (5.3L Vortec V8)
Ram 1500- 8,550 (5.7L HEMI V8)