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Did you get those tires on yet? I have the same year truck and am also thinking about running the 275/70/18. Would be interested in any pics of the tires. Any clearance issues?
You can easily run 275/70-18's on a 2004-2008 without any issues. I've put over 97K miles on my 07 with this size without any contact, even with the plow.
Here is mine bfg 275/70/18 at ko with no level. Also took picture of old tire next to new. Called bf goodrich and got recomended tire pressure base on my old tires rugged trail 275/65/18 useing the 32psi on door plate. BFG recomended 50psi .
I have an 05 fx4 with 3.73 gears. I plan on upgrading to this size, will I notice a change in fuel economy? Also how much off will my speedo be? Should I plan on recalculating?
I recalculated mine via a Gryphon programmer, wasn't too far off though, maybe 4-5 kph. I ran my 275/70/18 BFG At's for about 2 months before I got my level kit, I had no issues with rubbing, I just liked the look of a leveled truck.