New gears for 35" tires?

[Glen24]

If staying with 35" tires, is there any benifit to changing front and rear gears. If there is what gear would you go with?

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[Brian_B]

Low gear number (higher/taller geared) will get better fuel economy, but lower acceleration and low end torque at the wheel. You can gear tall enough (or rather, select a tire big enough) that your top gears become useless as you don’t have enough torque at the wheel to run them any longer

Higher gear number (shorter/lower geared) will have more torque but will shift more often, you can gear low enough that it’s too short and needs to skip gears.

It’s a tradeoff, like most things. Ford selected 4.70 for their 35” package, but even the 3.73 will run 35s without breaking anything - you just won’t be smoking people off the line with a setup like that. There are kits to go as low as 5.38 if you wanted to.

 

[Valhalla]

If i were never coming off 35's I would shoot for around a 4.10 ~4.30.

 

[Oldhippie]

Ford picked 4.70 for efficiently/fuel mileage with the steep overdrives in the trans and higher rpm ranges of the smaller engines…works pretty good for 35s…I would like 5.38s with my 37s but not enough to change them…what was the question again?…

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