37" tire gear ratio? - Ford Powerstroke Diesel Forum
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post #1 of 39 Old 01-13-2014, 11:58 AM Thread Starter
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37" tire gear ratio?

Hi I was just wondering what gear ratio you would suggest. I have a 2013 F-350 daily driver running 37" tires. I tow a 26' toy hauler maybe 2-3 times a year 900 miles round trip to the Oregon dunes. I have been looking at nitro gears and they offer a 4.10 and 4.30 gear ratio but i don't know what one to go with. thanks
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post #2 of 39 Old 01-13-2014, 12:55 PM
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I'd say for the 37s youd be better off going with 4.56 gears, the truck will be better off the line, and it'll be better when towing the trailer.

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post #3 of 39 Old 01-13-2014, 04:16 PM
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I have a 15k pound (dry) 42' toy hauler and stock tires with 3.55's on my 2013. I have only pulled it once so far, but the truck has plenty of power to haul it. I had to put on bags for the pin weight but power wise I was thoroughly pleased. What gears do you have now? Have you towed it yet to see how it handles it?

Edited... I have 3.55's

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post #4 of 39 Old 01-13-2014, 04:24 PM Thread Starter
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yeah I towed it a few times twice to Florence Oregon and once to whistler and it made it there but it was pretty sluggish when it came to any steep hills. I just don't want to put to much stress on the drive train if I don't need to.
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post #5 of 39 Old 01-13-2014, 04:35 PM
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I'd go somewheres around 3:73. I have the 3:31s on 37's and it definitely needs a regear.
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post #6 of 39 Old 01-13-2014, 04:35 PM
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I hear ya. It is pretty flat here in Dallas. If I were heading to the hills... Especially with 37's it would be a different scenario. If it were me and I would probably go with the 4.30 if ya don't mind taking a little less mpg when unloaded.
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post #7 of 39 Old 01-13-2014, 06:30 PM
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+1 on the 4.30s I think 4.10s for 35s and 4.30s for 37 are perfect

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post #8 of 39 Old 01-13-2014, 07:08 PM Thread Starter
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thanks for the replies. nice looking truck Carli'd6.7. I'm loving the pintop system on my truck.
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post #9 of 39 Old 01-13-2014, 10:06 PM
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I'm eventually going with 4.10s and 37s. I think 4.30s will be a little much for 37s unless you're towing all the time or only drive in the city.

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post #10 of 39 Old 01-15-2014, 11:41 AM
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Quote:
Originally Posted by BigGreen06 View Post
I'd say for the 37s youd be better off going with 4.56 gears, the truck will be better off the line, and it'll be better when towing the trailer.
This is way overkill for a 2011+ truck. 4.10's is plenty and will be quicker than stock, 3.73 would be a hair slower than stock simply because of the added weight of a 37" tire vs a 35" tire but straight ratio wise is almost identical to a 3.55 with 34.5" OEM tires.
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