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I was wondering the same thing. I have a 6.5" lift on a 2000 f-250 with 35" tires and at times could really go for something larger. I've been told 37" will work without much issue other than some rubbing at the front valance and full lock. I realize I've been no help to you but I hope you can get the answer we're both looking for.
Unless you want to deal with a lot of rubbing or trim the heck out of your truck, I would not try to do anything bigger than 35" with a 6" lift. I ran 35" when I had a 5.5" Fabtech lift, and went with 37" with the 8" lift I now have.
Thanks for the help. If I decide to go with 37'swould I need gears?
I'm running 37's with the stock 3.73 gears and I don't see an issue with it. I suppose if I could flick a switch and see how the truck performs with stock size tires I would be able to detect a difference. If you happen to have 4.10 rear gear ratio, I would think you would be sitting pretty.
Look at the "vin" sticker inside the driver's door jam....should be a white sticker. The rear end should be there in a two-digit code. This might help...
I have an 05 F-350 and I ran 325-65-18 Toyos and 37-13.50-18 Mickey's on a 6 inch lift. Slight trim to the front fender and I was good. Running 38s on an 8 inch lift now.
I suggest the Hankook 37 x 12.5, if they have them in 18". I ran the Toyo 37 x 13.5 x 17 and while they are a great tire, lasted 40,000 miles, were relatively balanced (used bead bags), and quiet for an MT they were a little wide which put alot of strain on the steering gear. I put the Hankooks on and only being 1" narrower there isn't as much strain on the steering gear, in fact it steers like the oem did. Had to put a little weight on 1 of them, they actually performed better in the deep stuff then the Toyo's did and were a little cheaper.
I have a DR 7" lift with 1" TIE and would get rubbed on the lower valence with the suspension loaded in a turn and the 13.5 wide Toyos. Now with the 12.5 wide there is no rub at all, even with V-Bar snow chains. They are a little louder but still 'quiet" for an MT.
I was going to get the M16 as well but was in a bind and could not get them before my last hunting trip, their customer service was a joke...they never answered the phone when I or my dealer called to get them to ship a set. We tried for over 1 week.
Please keep us updated on them, I want to know how many miles you get out of them and how they perform on and off road.
Will do im taking them out to the beach in about a week an ill post back....but heres how they are on road since thats all iv done so far....people said they are super hard to balance there is a slight wooble at 58 mph very slight in fact no one else feels it except me...but i know my trruck....for as aggressive as they are they are not that noisy...you can just barely hear them on the highway and if u have ur radio on at u wont hear it at all...they ride very smooth and do well in wet weather...although i live in houston sooo it hasnt been very wet lately haha. Ok I took a few pictures i dont know how to put them in here so they are in my gallery
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