Hello everyone, first of all I apologize for the translation. I have a problem, and lack of knowledge I have not been resolved, I turn to you who have more experience and knowledge to do - I have the FX4 truck, 4 WD, 2007, the OEM tires were 255/65R17 and replaced it with ATR DISCOVERER LT315/70R17 COOPER, assume that the original ratio is 3.73. The question is: For a more ripped from 0-60 miles and then, with an enviable travel at high speeds without keeping the engine at high rpm, you do not lose or sacrifice performance, fuel consumption is not limiting and in my country, gasoline costs $ 0.79 / gal, no drag cargo or trailers, travel 90% of time on paved roads and the remaining 10% in light OFFROAD, what should I install? 4.56 or 4.3 ratio. Explain, please. Thanks.

 

4.30 is not available for the front axle in a 4wd. Use 4.56. You could use 4.10, but it will not make much difference from 3.73.