cmbowles25

A lower gear will NOT give you more power at lower rpm. It will increase rpms. That is what you need with the 5.0 due to the power band. The most effective way to gain more power in lower rpms is forced induction (turbo, supercharger). My 5.0 with 4.10 gears and 33" tires will turn about 2k rpm at around 65. Stock was around 1500.

SteveLord

I went from 3.55 to 4.11 and have 34"/66lb tires.

Anyone that says 3.55 gears push 35" tires just fine must live on a flat earth. That or they like the sound/feeling of their truck downshifting to 5th/4th gear at every incline.

A 50% increase in tire weight isn't "just fine" to your truck with the 5.0 or anything short of the Ecoboost.

cbr600rx7

That's partially true. However going from 3.73s to 4.10s does increase the torque multiplication and does increase the amount of force to the wheels. The engine is of course making the same power at any given RPM but more force is being generated.

I agree with the forced induction idea however it is costly and will typically require 91+ octane fuel where gears don't really care what octane your running. 4.30s would also be a option but I think I would stay away from 4.56s unless I was going to 35s of larger.

kersh04

Army_monkey had posted this; I found it very helpful..

Cj7jeepoffroad

Yup, 3.55's 35" BFG AT''s and 5.0, pulls along ok. doesn't down shift excessively IMO, runs about 1600 rpm at 70-75mph in 6th

cbr600rx7

Here is the best gear calculator you will find for comparing gears and tires:
http://www.grimmjeeper.com/gears.html

For me 3.73s and 32s are not enough. You notice it more on the mountains.

DirtDawg

^^^ OEM 3.73 gearset in combo with OEM size tires @ 50# each (Toyo OC A/T2 LT275/65R18C) works well in the mountains and towing too. But then, 6.2L grunt (unmodified with tuner) certainly helps!

cbr600rx7

I hate wishing I had gotten a 6.2 or EB but that's about how I feel every day.

sigma pi

Sorry for not being clear. If I were to regear I wouldn't go to 4.10s I would go higher. I have an ecoboost.

DavidKR

I've got 3.73s from the factory and am on 35x12.50s. I'm torn on this as well. it moves around okay as it is with several performance modifications and tuning, but it is starting to get to the point where it doesn't like cruising in 6th gear in the mountains like it did with 33s. I'm currently on a 2.5" level but plan to move up to a 6" lift in the spring, and was originally planning on staying on my 35s but lately I've been considering moving up to 37s and then regearing to 4.56s. for the investment of regearing both diffs I don't see the sense in only going up to a 4.10, I think the difference would be pretty negligible.