gears for 35's, are 4.56's too low??

[dondiesel444]

what gears are good for running 35's? are 4.56's too low?

[Vulcan800]

Here's one calculator. http://www.4lo.com/4LoCalc.htm


I'm sure you can find many more by doing a google search.

[strong_like_tractor]

Here's a nice table that I like to refer to http://www.intercotire.com/html/table.htm

JP

[mikeym]

with a psd, id say theyre too low. look at 4.10s, highest id go would be 4.30s...

[ptsuperd]

I'm running 4.56s with my 37s and i think they are too low for them even. I think 4.10s or 4.30s would be better with my setup.

4.10s would be perfect for 35s.

[MattBMiller]

What are you planning on using it for? Personally, I'd keep the 3.73's.

Matt

[dondiesel444]

thanks guys, I've seen those gearing calculators before but they are for gassers. so SuperDuty's with V-10's came with 4.30's stock??

[Hitch]

I ordered my 04 V-10 SD with the 4.30s as an option...work great with my 37's.

[dondiesel444]

maybe I could find someone who'd wanna swap with me [img]/ubbthreads/images/graemlins/crazy.gif[/img]

[redrocket]

I went with 4.10s with my 35s, and I was around 2000rpms at 65.

hope this helps

redrocket

[ZooDad]

Unless you are towing REALLY heavy 4.56 will be too low.
I have 315(35) with 4.30 and it tows great, glad I have it, but unloaded stinks. I am actually thinking about a GV to go on it.
The perfect (IMHO) is 4.10 for the 315(35) tire. Best of both worlds.

On a side note, most 35 are actually closer to 33.5, so use that number when figuring in the calculators.

A while back I wrote an Excel sheet with the different sizes and ratios to get a close to accurate rpm for your truck.

ZooDad

[rdvit94]

I looked into that once Don, and I think 4.10s will bring you the closest to stock. Of course, if you have any plans for tires larger than 35s you might want to consider the 4.56s.

[dondiesel444]

I don't know what to do, I definatly want to get 35's real soon, but I don't wanna swap 4.10's in there, it's not THAT much of a difference to justify the cost. however who knows in the future if I'll go with an even larger tire, 37"-38" is probably the biggest I'd ever want for my needs.


I guess I'll jsut stick with the 3.73's and 35's for now and add some more power mods to make up the difference [img]/ubbthreads/images/graemlins/smokin.gif[/img] unless I can find anyone with 4.30's who'd wanna swap axles.

most likely I'll go with a bigger lift and tire in the FAR FAR future, and if I did swap for 4.10's I'd kick myslef later on.

[mikeym]

id save your money or put it towards more power. ive towed over 10k numerous times with 37s and 3.73s with no problems, but im making a lot of power to make up for it. if it were my truck, i wouldnt spend the money on gears, i didnt break down for gears until i got to these 40s...

[Loser1]

I just installed 4:30s and I'm running a 315/75/16 BFG Mudder. The tire isn't a true 35" it measures 34.6" but close enough. the 4:10s will bring the effective gear ratio to about a 3:70 or so. That's as close to stock as you're going to get. I chose the 4:30s over the 4:10s because my 5er is a bit heavy and I wanted that extra grunt. The 4:30s bring the effective gear ratio to about a 3:89. The 3:89 is just between 3:73s and 4:10s.

What I've noticed

@ 55mph (really about 60 w/tires) my aprox rpms are 1750
@ 60mph (really about 66 w/tires) my aprox rpms are 2000
@ 65mph (really about 71.5 w/tires) my aprox rpms are 2250

I think I'm actually getting better mileage. I don't have to put my foot into it to get the beast moving or keep it moving.

I'm happy I went with the 4:30s over the 4:10s. I can't wait to pull the trailer next week!