2007 offered a 6 cylinder, 4.7 V8 and 5.7 V8. Can you point out where it states the engine was a 5.7? All I found was one of the related posts stated it was a 4.7 liter V8
Apparently the always trustworthy (*cough*Gawker*cough*) Jalopnik claims it's the 4.0 V6
http://truckyeah.jalopnik.com/heres-what-a-toyota-truck-looks-like-after-1-000-000-mi-1776141464