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Old November 16th, 2009, 10:49 PM   #1
BabyBoyTJ
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Thumbs up What will 4.10's do to my gas?

Putting 4.10's in my 02 automatic 4.0L 6cyl. I only run 32 11.5's so any input on the gas mileage and power, take off. Just curious so let me know what you already know
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Old November 16th, 2009, 11:11 PM   #2
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It will help you off the line and around town....maybe get you a few more miles to the tank, but you will start to see a difference on the highway after about 65mph. (higher RPMs to maintain speed)
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Old November 16th, 2009, 11:15 PM   #3
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I have the same set up in your post and its great for driving around town but i hate going above 60 on the highway if i do 65 my rpm's are at 3k
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Old November 17th, 2009, 06:19 AM   #4
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What do you have now?
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Old November 17th, 2009, 11:02 AM   #5
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Just the regular 3.07's. Thats pretty good, I do mostly city driving anyway.
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Old November 17th, 2009, 11:06 AM   #6
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Quote:
Originally Posted by BabyBoyTJ View Post
Just the regular 3.07's. Thats pretty good, I do mostly city driving anyway.
Was the automatic a 4-speed by 2002? I know they ran the 3-speed for a while.

If you have a 3-speed, you'll probably hate a jump like that and will be running too high on the highway. If you have the 4-speed OD automatic, it'll be pretty good and only a hair overgeared. 4.10's are usually associated with full 33's.
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Old November 17th, 2009, 11:15 AM   #7
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Im not sure but I can find out today. My jeeps in the shop getting painted so I wont have it back untill like friday. But I know it has OD so its probably the 4speed. I also plan on stepping up my tires soon.
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Old November 20th, 2009, 09:37 PM   #8
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Quote:
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Just the regular 3.07's. Thats pretty good, I do mostly city driving anyway.
I might be mistaken, but I think you have 3.55's with an auto - isn't the 5 speed the 3.07's?

I think going from 3.55's to 4.10's with your tire size increase should bring you backclose to "stock"gearing.
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Old November 20th, 2009, 09:41 PM   #9
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http://www.4lo.com/calc/geartable.htm
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Old January 10th, 2010, 07:19 AM   #10
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4.10's will be fine. The vehicle will feel lighter, faster, and should use a touch less fuel.
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Old January 10th, 2010, 01:54 PM   #11
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4.10's will be fine. The vehicle will feel lighter, faster, and should use a touch less fuel.
Now you gave him a fat head and he will be racing every Honda in town
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Old January 10th, 2010, 02:17 PM   #12
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By way of comparison, when I went from 3.07s to 4.56s with a 98 4.0 5-speed TJ it felt like I went from a 4-popper to a built SBC. Gas mileage was slightly better, but not enough to talk about - as though mpgs are typically something one worries about with a modded TJ...
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Old January 11th, 2010, 08:34 PM   #13
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You will definitely get better mileage, but usually people get on the gas more to enjoy the newfound acceleration and negate any mileage increase.
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Old January 11th, 2010, 09:09 PM   #14
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I'm curious about this too, but I have a '98 4.0 auto XJ. I'm on 32s but I think I'll jump to 4.56s, even though I could just buy some stock 4 banger 4.10 axles for cheap so I don't know.
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