Thanks for the link Cactus. I sent them a request for the build sheet. Yea...I have the factory 20's on my truck so I guess I got the 3.92. The tag on my axle is pretty much ruined and unreadable. And I dont have the sticker on my door. Im puzzeled as to why I dont have the sticker in my Glove box unless, it was replaced at one time. My dad has a 04 2500 with the Cummings and he has his sticker in the glove box.