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I have a 2015 F-350 SRW. Im finally putting a Readylift 2.5 in leveling kit on my pickup. I've heard different things on 35's or 37's...pictures and comments on yours please! I have a take home so I don't drive it much
No not quite, the 20's are 34.1" ........ OP, are your stock wheels wide enough for a 37? Personally, I would run the 35's, a 37" tire puts a lot of strain on your suspension and brakes.
Money that's about the real difference. What gears to you have? The bigger the tire, more of a dog the truck will be unless you want to regear. All depends what you want as far as looks and what to spend.
Stock wheels are not technically wide enough for 12.50 tires, but a 37 is going to rub your radius arms like crazy with stock wheels. Get it out far enough with aftermarket rims to not rub the radius arms, it's got to rub your fenders and bumper bracket like crazy with a 2.5" lift.,, unless you have the snow plow prep springs and no plow/heavy bumper on the front, which you have. If you have standard springs with that bumper, I don't know if a 3.5" would clear.
I run 37's with a 3.5" lift on a 18x9 with +1 offset. I had to trim a tiny amount of the wheel well liner on the drivers side to get no rub on street driving, including off camber pull ins.