37" tires now what?? - Ford Powerstroke Diesel Forum
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post #1 of 28 Old 03-16-2010, 04:52 AM Thread Starter
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37" tires now what??

I have 37" tires with a 4" lift but I have 355 gear ratio rear ends. What should I change it to? Im not doing a lot of pulling or racing, mostly highway driving.

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post #2 of 28 Old 03-16-2010, 05:13 AM
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If that's all u are doing then I would go with a 4.10....I have 37's on mine but mightt go to 22;s with 40"tires and plan on either going 4.30 or 4.56 max

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post #3 of 28 Old 03-16-2010, 05:16 AM
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I'd recommend 4.30's instead of the 4.10's.

From the factory, you could buy a truck with 34" tires and 3.73 gears. I kept my 3.73's for a while after I lifted (riding on 37's now) and then went to 4.30's. Been very happy with the choice I made.

In your situation, should you choose to go with a slightly larger tire (38"-40"), the 4.30's will work nicely. Plus, if you DO tow something currently, you'll be happy you have the 4.30's.
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post #4 of 28 Old 03-16-2010, 05:23 AM
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The reason I suggested 4.10 is because he said he does mostly highway driving and not really pulling with it....for mostly highway driving the 4.10's will get you a little better MPG...but yeah if you are going to be towing then deff the 4.30 setup..

Snake..just outta curiosity how much lift do you have and what kinda MPGs are you seeing with that setup and the 4.30s?

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post #5 of 28 Old 03-16-2010, 05:30 AM
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Oh and by the way...mine has a 6in lift with 20s and 37in tires now...has 3.73 gears and its a SLUG...lol

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post #6 of 28 Old 03-16-2010, 06:26 AM
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I have an 8" lift and 36's on 18" rims with 3.73s and my truck does fine?? it's def not slow by any means? it's a stick though does that matter? But for highway driving i don't see why he would need to go higher than 3.73s?
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post #7 of 28 Old 03-16-2010, 06:39 AM
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Originally Posted by armyguy209 View Post
The reason I suggested 4.10 is because he said he does mostly highway driving and not really pulling with it....for mostly highway driving the 4.10's will get you a little better MPG...but yeah if you are going to be towing then deff the 4.30 setup..

Snake..just outta curiosity how much lift do you have and what kinda MPGs are you seeing with that setup and the 4.30s?
I'm sitting on 8-9" of lift and I'm getting about 12-13 mpg. Not too bad considering my truck weighs 9,500 lbs (22" 10 lug Alcoas, 8 to 10 lug adaptor plates, Rize 4-link, full size spare, 60 gal aux fuel tank for veggie oil, topper, stereo equipment, etc...) Each tire/rim combo weighs nearly 200 lbs!

What really kills me is that the speed limit on the highways in FL are 70 mph and I end up running 75-80 mph. If I stayed around 70, I'd probably get close to 15 mpg. Not really an issue now though since I converted to veggie oil.

I get the same mpg now as I did with the 3.73's and 37's but my truck has a lot more giddyup.

Last edited by Snake; 03-16-2010 at 06:43 AM.
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post #8 of 28 Old 03-16-2010, 06:41 AM
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Originally Posted by MUDSTROKIN' View Post
I have an 8" lift and 36's on 18" rims with 3.73s and my truck does fine?? it's def not slow by any means? it's a stick though does that matter? But for highway driving i don't see why he would need to go higher than 3.73s?
Yeah, the stick makes a big difference. I had a friend on 37's with 3.73's and he dropped his tranny temps almost 20 degrees by going with 4.30's.
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post #9 of 28 Old 03-16-2010, 06:50 AM
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Originally Posted by Snake View Post
Yeah, the stick makes a big difference. I had a friend on 37's with 3.73's and he dropped his tranny temps almost 20 degrees by going with 4.30's.
Yea but i'm wasn't refering to tranny temps... i'm guessing mine being a stick lets me put more power to the ground to roll these things over?
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post #10 of 28 Old 03-16-2010, 06:55 AM Thread Starter
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how many rpms would it be running at say 70 with 430? I was wanting to keep it a little less than 2k because I like most ppl run between 75-80

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