I found a brand of tire that works good for what I do. Just do I want to spend the 1500 dollars on tires right now. I have a set of bandag retreads that have 40% tread left I took them off the 03 because they had a thump to them. I need to find out what Ford is going to sell a Detroit true trac I need one. I guess this truck was spec'ed with a high tow capacity and it comes with a open diff. A open diff is a one wheel peal the True Trac works great it works good in my 2003. I think I will keep the 4:88s when I'am doing 80 Km/h which is the speed limit the engine is reving 2000 rpm. The lower axle gears will help with crawling up the access roads. I didn't even know this truck had 4:88 till I found the axle code. There isn't much difference compared to the 4:30 axle ratio in the 03. The true trac does cause locker steer ie it wants to go straight if it was possible you could leave 4 black lines on the road. The true trac is a very tight Positraction. The only difference between it and a Detroit locker is you don't get the the clicking and tire chirp.