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Message: [QUOTE="TyCorr, post: 896722, member: 1451"] My lowly 7.3 with a 6" lift and 35s tows fine with 3.73s and not much else. Its got an srp 1.1, 38r with billet wheel, and a full competition type fuel.system. I was running loads from home to Arlington the ine weekend. I had my worktruck 12 cclb dmax and my retired personal truck the previously mentioned 7.3. I had Bill get me some tunes as tye ones i had were 5 years old. The new tow tune is great. I think it was called a 60hp "heavy" tow tune. Foot to the floor, 10k kb trailer(closer to 20k gcw) goung up 5% for 2 miles then flattening out and another mile of 3% grade. Egts never went over 900°. Thats with 35s and a 38r. I hear you guys about amaller tires helping spoolup but I think that is misguided. You are seeing the engine wind out quicker with less effort from the charger. The fact is a stock tired truck is overgeared as all hell. 2500rpm on the interstae at 70mph? ***k that. Anyway, the old dinosaur pulling those kinds of loads shines. The dmax is hunting for.gears. It doesnt like being held in 3rd or.fourth and wound. But that is.precisely what you have to do manually to.tow.with any decent control. There is no dynamic range within a gear. It shifts winds that gear out in 2 seconds anx now the whole bs begins again. As I said my old truck is sporting the 265k mile plus ads and it is fine with enhanced fuel.and oil performance. For any load over 10k 350rwhp is all id want total. A 33 would be a good all around tire but you would.sacrifice some cruising ability on interstates due to rpms. A 35 will allow loafy rpms in top gear. Im not sure if having larger tires on a truck with a 5 or 6spd auto would fix the things I hate about them or make it worse :shrug: But as it is I prefer my old bitch for towing. The number two on the list would probably be my 07 lbz classic. It falls in the same range as my 7.3 though so theres something to be said.for that range of.power on a tow rig. As for empty driving, who gives a shti? I mean really. A tuned 6l will run a 38 with no power issues. You can do anything if youbwant. I had 40s and towed with tuning. It sucked taking off but after 20mph it didnt matter. Od was useless. You pretty much ran up into third and could do two.lanes with the od locked out and then when you got on a "big road"(65mph speed limit) you enable it again and go 80mph at 1800rpms LOL [/QUOTE]