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Old 02-18-2012, 05:23 PM
yankeerebel17 yankeerebel17 is offline
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Default 4.10 rear gear ratio question.

my truck has from factory, 4.10s. i was curios if gettin bigger tires would help my gas mileage.... i have 27-27.5 tires on it now, but was lookin at some 29-30 inch tall tires..... im runnin right around 2200 with my tires now. what do you guys think, would this work??
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Old 02-18-2012, 05:24 PM
pooleo pooleo is offline
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Default Re: 4.10 rear gear ratio question.

yup, going with a 30x9.50 should get you around the 3.73 ratio
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Old 02-18-2012, 05:30 PM
Eagle Eagle is offline
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Default Re: 4.10 rear gear ratio question.

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Originally Posted by pooleo View Post
yup, going with a 30x9.50 should get you around the 3.73 ratio
32s put me at 3.73,,????

i get 19 mpg mixed
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Old 02-18-2012, 05:32 PM
djfllmn djfllmn is offline
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Default Re: 4.10 rear gear ratio question.

im running 31s on mine and i avg 13 city and 18-20 highway
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Old 02-18-2012, 05:32 PM
Greg R Greg R is offline
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Default Re: 4.10 rear gear ratio question.

it doesnt help me i have 245 75 16 they have a rolling diameter of 30.5" im running 2350 rpms at 60 mph and i average 16 mpg.
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Old 02-18-2012, 05:34 PM
Eagle Eagle is offline
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Default Re: 4.10 rear gear ratio question.

it dropped me .7 mpg
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Old 02-18-2012, 05:36 PM
LoJosRanger LoJosRanger is offline
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Default Re: 4.10 rear gear ratio question.

Quote:
Originally Posted by yankeerebel17 View Post
my truck has from factory, 4.10s. i was curios if gettin bigger tires would help my gas mileage.... i have 27-27.5 tires on it now, but was lookin at some 29-30 inch tall tires..... im runnin right around 2200 with my tires now. what do you guys think, would this work??
I always thought bigger tires would hurt your mpg's? Especially if they're a lot heavier.
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Old 02-18-2012, 05:41 PM
Silver Bullet Silver Bullet is offline
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Default Re: 4.10 rear gear ratio question.

i have 4.10's with 33's. That brings me down to about a 3.35 gear ratio all said and done. dropped me about 2-4 mpg's as I do a lot of lower speed driving on the farms and back roads. I plan on re gearing to 4.56's when I get the money to bring me up around the 3.73 ratio. I noticed a good drop in torque but a good gain on my highway cruising rpm.
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Old 02-18-2012, 05:44 PM
djfllmn djfllmn is offline
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Default Re: 4.10 rear gear ratio question.

i didnt notice any power drop when i stepped up to 31s but i did notice a big MPG drop
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Old 02-18-2012, 05:47 PM
06fordfx4 06fordfx4 is offline
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I've got 31's (fx4 level 2's have 31's right?) with my 4.10 I'm at about 2100 rpms @ 63-64 ish mph
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Old 02-18-2012, 05:48 PM
yankeerebel17 yankeerebel17 is offline
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Default Re: 4.10 rear gear ratio question.

yeah im lookin at more higher big road mpg... i tend to stay away from cities and highways. i found a website that will give you the size of tire you need with what gear ratio to get a certain rpm. it said my gear ratio with 29-30 inch tires will put my 55 speed rpm at 2000 rather than the 2200 it has now, it said it will give me a +5-6% gain in mpg.
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Old 02-18-2012, 05:48 PM
djfllmn djfllmn is offline
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Default Re: 4.10 rear gear ratio question.

yep level 2s came with 31s stock
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Old 02-18-2012, 06:17 PM
TRWXXA TRWXXA is offline
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Default Re: 4.10 rear gear ratio question.

Quote:
Originally Posted by yankeerebel17 View Post
yeah im lookin at more higher big road mpg... i tend to stay away from cities and highways. i found a website that will give you the size of tire you need with what gear ratio to get a certain rpm. it said my gear ratio with 29-30 inch tires will put my 55 speed rpm at 2000 rather than the 2200 it has now, it said it will give me a +5-6% gain in mpg.
That's a theoretical MPG gain. In reality you'll probably see about half that. You will be slinging around more weight with bigger tires, and rolling weight really hurts as it has both linear and rotational inertia that must be overcome.
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Old 02-18-2012, 06:19 PM
pooleo pooleo is offline
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Default Re: 4.10 rear gear ratio question.

actually, scrap everything to this point. You have a 2.5. You will not have the torque to maintain a bigger tire and still get good mileage. I would stay with what you have.

Most online calculators are based on a v8 at a 1:1 ratio. But, you have to factor in the torque the v8 makes, it can maintain a higher ratio without lugging. But your 4 cyl will have a hard time.

Right now your final drive is around 3.23. If anything, go DOWN in tire size to get that up to about 3.55. Or, just cruize around in 4th.

fwiw, we put 235's on my dads ranger (2.3 5spd) He could not run 5th gear without lugging and loosing mileage. But, he had 3.73. We swapped in a 4.10 expo and he got back to where he should be.
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  #15  
Old 02-18-2012, 06:19 PM
Greg R Greg R is offline
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Default Re: 4.10 rear gear ratio question.

Quote:
Originally Posted by djfllmn View Post
yep level 2s came with 31s stock
are they 31s or 245 75 16
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