Hey MercedesTech, I noticed you live fairly close to me, I live in Pleasant Hill, CA which is near Walnut Creek. I just picked up a used 2004 F150 with 160,000 miles for a steal and now I want to put in the cash I saved into the truck. I threw 33's on it already and I am thinking about swapping the gears out. I am not sure if it has 3.55's or 3.73. I saw a bunch of posts about guys putting in 4.56's with 35's. With 33's, would you recommend 4.11's or 4.56's? Also, I would love to buy them through you if you can get me a deal. Finally, I work for a petroleum distributor so I can hook you up with oils, fuel, etc for cheap. My email is pat@ggpetroleum.com.Thanks, Pat O'Keefe