Freeing up power and need some insight!

[BLFX4K]

You're making your truck work too hard with 4.10 gears

Go to 4.56's or 4.88's if you plan on 37" tires or for some extra city get up and go.

Electric fans make a huge difference and there are several routes to go. Whatever route you choose, just pick one and do it right the first time over

You will love the electric fans and gears, I would also recommend doing the underdrive pulleys while your fan is out and you have access to the engine bay and custom tunes to tie it all in together

IF you're mileage concerned the fans and pulleys should net you 1-3 mpg average. I saw 2mpg increase on the fans and the gears will help ease the stress on the transmission as well as gain back the hp/tq lost from those 35s

[hampsterzone]

Thanks, I really appreciate it. My mechanic says 4.56's will give me lots of off the line power/torque but my top end power will suffer from being at too high of rpms. What is the best route to go? in all honesty. They will be ordered today, so I kinda need to know what to buy soon. I just want good power and not to affect drivability. Thanks to whoever responds.

[Longshot270]

If you go with the 4.11 gears, you'll have a similar drive ratio of a stock truck with 3.55 gears. I would go one size bigger to give you more low end power that you were used to. That might even improve your mileage compared to the gears you've got now.

[hampsterzone]

One size bigger than 4.11? My truck has 3.73 in it now. So does that mean I should go w/ 4.56? Or 4.11? Thanks.....

[Longshot270]

When you went from stock 30ish inch tires to the 35's, you went to having something similar to an effective 3.11 gear ratio. If you put 4.11 gears in, that is similar to 3.55s.

Pegasus has a little gear ratio tool and the chart on this website Differential Gear Ratio Chart - Tire Size to Gear Ratio
That chart is pretty close to what I see going 70 with O/D off and the TC locked. You should play around with those to get a better idea of what the different gears will result in.

[BLFX4K]

If you haven't ordered already I'd go with 4.56s

How often will you be up in the higher rpms running sprints to 100mph+ with 35s it is not the safest idea

I believe there is a company that makes 4.30's but only the rear set last I checked.

going to 4.10s from 3.73s is NOT worth the amount of money you are going to spend. Do it once and do it right, 4.56s!

[hampsterzone]

Thanks a million! I already ordered the 4.56. I also ordered the electric fans from FF Dynamics which were the extreme duty ones. My question is, how much power will I noticeably feel with everything I have done one my truck. Keep in mind, I will be running 91 custom performance tunes, 4.56 gears, efans, along with all my other mods together for the first time.