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Discussion Starter #1 (Edited)
I think I have my tires picked out. Now I'm looking for the best size regarding gear ratio. With the 3:55, would I be better of with a 275/70r18, a 285/65r18, or 295/65r18. I understand the fuel mileage drop regarding going up in size, and thats not as much concern as the power loss out of the motor, meaning the get up and go! I drive pretty easy, but I like to have that power when needed. So how tall and wide can I go before significant power loss is noted? Any help or experience with this would be greatly appreciated.
 

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I went with 285/70R17 (33x11.50). I have the 3.55's. Yeah mileage went down but I haven't noticed really any difference in the power, even pulling my compact tractor behind me.
 

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I dont think ull notice much power loss. The engine has so much tq n the 6sp is better than an old 4sp. I have 20's and went to a 275/65/20 before my level, tune or intake n didnt really notice. I personally dont like wide tires. Rock Knicks n what not from stuff kicking up. I had 275/70/18's on my silverado n loved it. They're cheaper than a 285/65/18 by up to $50/tire and they normally weigh less. The 275/70 bfg ko ta was 33.2"x11 vs the 285/65 being 32.5"x11.5". The 1/2" wider is noticeable tho, especially withe the trucks weight on the mounted tire. Ford has bigger wheel wells, so if u level, u may want the taller 275/70
 
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