35's without rubbing
 

I've got a 2010 F150 4WD and most likely going to use the Rough Country 2.5 inch kit with the 1 inch rear block. I've got 17x8.5 Vision Warriors with a 5.71 backspacing and +25 offset. I currently have 285/70R17 Falken Rocky Mountain All terrains and after the kit I want to run 35/1250R17's. Am I going to need to trim at all? Any help is much appreciated.

You would need minor trimming on the front valance, but should be able to fit them. I found 315/70/17 to be cheaper and more tires available and they are about the same size.

That's what I was looking at. I'm really happy with the Falken Rocky Mountain AT and they are made in both sizes with about a $45 price difference per tire. Did you have to trim?

youll have to trim a little with after market wheels

Those wheel specs sound almost ideal to run 35's. I ran 315x70x17 BFG's on my '04 on 17x8 wheel's with 5.5 inches of BS with no problem's. Your '10 ought to have a little more room in the front to clear 35's except for the plastic spoiler which can be trimmed easily. A 295x70 or a 305x70 would work out great too and give a little more room.

Zero trimming for me with two inch level. 17x8 with 5.43 inches bs and +25 offset.
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