4.10 or 4.30 with 315/70x18 - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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  #1  
Old 08-16-2014, 11:26 AM
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4.10 or 4.30 with 315/70x18

Anbody regeared for pulling 15000 lbs ??
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Old 08-16-2014, 11:37 AM
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How frequently do you tow? At 35" tires, you would be fine with either gears. It might not be worth it to your pocketbook to just go up to 4.10's if you are looking for better mileage. The 4.30's will give you better power while towing and are the choice for the Tow Boss (dually) setup for that reason.
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Old 08-16-2014, 02:33 PM
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It has been a while but I was looking at doing that with my ol 04 I had for a while. From what I got talking to a local gear shop the 4.30s were about the same as 4.10s with stock tires and the 4.10s were roughly the same as 3.73s with stock tires. This is if your using 35" tires.

This is just how the tranny and stuff see it so transmission of power will be about that however gas mileage is another story.
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Old 08-16-2014, 06:26 PM
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With a true 35" I recommend the 4:30's if a larger charger is in the future definitely 4:30.. I like my 4:10 but they make 60-65 difficult towing.. I am right between gears at that point.. the truck pulling 15 - 17k loves 70-80 mph. However tuning is huge.. I am. Amazed in the difference between tuners. That is key for sure
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Old 08-16-2014, 07:39 PM
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Another guy had a similar question... So i just copied and pasted my input. Hope it helps



It is fairly simple math... but it will all come down to what you want. Most guys like to tow around 2500-3000 rpms to maintain a nice speed with a heavy load. 2000 rpms will be lugging and you won't be able to maintain speed up hill and 4000rpms is way to high to maintain for long periods of time because it will wear out your motor and run much hotter...


So.. decide at which speed and rpm you want be able to pull at. A lot of guys like 65-70mph at around 2500rpms... so...

35" tires
3.73 gear ratio
2500rpms
5th gear = 63mph
6th gear = 98mph

That makes you going either just slightly too slow or way too fast. If you try and hold OD/6th gear at 70mph then your rpms will be around 1800rpms and you will not be able to keep up that speed up the hills (even with a ton of mods)

So lets change the gear ratio to 4.10

35" tires
4.10 gear ratio
2500rpms
5th gear = 60mph
6th gear = 89mph

So lets change the gear ratio to 4.30
35" tires
4.30 gear ratio
2500rpms
5th gear = 55mph
6th gear = 85mph


So with 4.10 gears if you went up hill at a safe 65mph in 5th gear, but cruise on flat ground at 75mph in 6th gear... then this is what you would get

35" tires
4.10 gears
65mph in 5th gear = 2800rpms
75mph in 6th gear = 2100rpms


So with 4.30 gears if you went up hill at a safe 65mph in 5th gear, but cruise on flat ground at 75mph in 6th gear... then this is what you would get

35" tires
4.30 gears
65mph in 5th gear = 2900rpms
75mph in 6th gear = 2200rpms


You get the idea... here are some links to help. Just play with it until you get the numbers that are most desirable to you

5R110 - Power Stroke Wiki
Gear Ratio Speed Calculator
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Last edited by peixinho; 08-18-2014 at 06:31 AM.
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Old 08-16-2014, 08:13 PM
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I'm running 155/stock inj with a powermax WWII atlas 40 with heavy tow tune from bill @ php truck falls under turbo at 65 down shift all kinds of power even if I get it to unlock converter EGT goes down to around 1100 ish
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Old 08-16-2014, 08:16 PM
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I think I'll do 4.30 regear with Detroit locker in the rear with a tru trac in the front
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Old 08-16-2014, 08:17 PM
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Thanks for the input guys
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Old 08-17-2014, 04:49 AM
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Quote:
Originally Posted by Pro fuzz View Post
I think I'll do 4.30 regear with Detroit locker in the rear with a tru trac in the front
Sounds like a plan. I'm very interested to see how this setup does since I've been researching this setup for quite some time but just haven't gotten around to doing it.
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Old 08-17-2014, 12:51 PM
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I regeared my truck with the 4.10's and kicked myself in the but for not going with the 4.30's. so now I am considering to bite the bullet again and regear it to 4.30's.
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