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  1. #1
    cher96 Guest

    Default Tire Size and Gear Ratio

    Here is a URL for several Gear and Tire Calculations:

    http://www.dirtroad.com/gears.htm

    Here is a pretty accurate Chart for Gear Ratios and Tire Sizes for Jeeps:



    Citation: http://www.jeep4x4center.com/jeep-ti...atio-chart.htm


    Disclaimer: I forgot that when I posted that I do fine with 32" Tires and 3.55 Gears that I have Heavily Modified my XJ and more than likely I have much more Torque and Horsepower than a Stock XJ.
    Last edited by cher96; 05-12-2009 at 10:33 PM.

  2. #2
    Voldemort Guest

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    Very cool I have seen this before and lost it thanks. I think the 4.88 is a great gear for 33" to 37"

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    With my automatic, 4.56 gears and BFG 32 MT I get 3000 rpm at 80 mph.

    This chart may not take into account overdrive.

  4. #4
    cher96 Guest

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    Here is another Tire Size and Gear Ratio Chart for Jeeps. You can see why I would run 4.11s with 33s and I have great Economy with 32s and 3.55s. I like Low End Torque and almost never go over 2500 RPM. This Chart differs, I believe, because it assumes you are in 4th gear with a 1:1 ratio whereas an XJ's AW4 in 4th gear is 1:0.75



    Citation: http://www.nakedjeep.com/Knowledge/M...GearChart.html
    Last edited by cher96; 05-12-2009 at 11:13 PM.

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    This is also great imfo to have on hand cher96, Thank you..........
    1996 XJ Sport-RE 4.5" & Daystar BB netting about 6"s..Adjustable Upper & lower control arms..HD adjustable track bar...RE Mono shocks...Mojave teflon rims w/BFG 32x11.50 KM2s...RR SYE & CV shaft combo...Treck's steering frame brace and M.O.R.E. Brace...Kargo master roof rack w/home brew light mount...Home brew snorkel w/K&N filter...Yaesu 857 & Galaxy DX99V CB radios...DeTours Backbone and Tailbone system...8000 lb winch....

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    I am running 3.73 with 33x12.5 and I also have an auto tranny - it has a button on the dash that does the pwer vs comfort and that button does work. Not sure what it does but on -power- it works much better. I think it is fine to drive around with those gear ratios and such - what worries me is the brakes. (no emerg stopping for me)
    2007 WK, Red Rock, 6cyl gas Laredo,
    1990 XJ Limited, Black Primer, Auto, 6cyl, 6.5 inch lift Rockrawler, 33x12.5 mudders, rhino lined interior, Swaybar discos, 3.73 gears, Select-trac 'Click below for full dedicated web page'
    www.jimwww.com/jeep
    Past: 2- Yj, 1- Tj, 2- Zj, 2- Xj

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    Default Re: Tire Size and Gear Ratio

    I'm running 35's w/4.56 gears. I run in low to 60, then shift up. I'm usually around 2500 @ 70 or so. Nice & smooth =-)

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    Default Re: Tire Size and Gear Ratio

    thanks for the information, very helpful!

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    Default Re: Tire Size and Gear Ratio

    Nice. Very helpful.
    I am curious if these charts apply to both AW4 and AX15? Does it make a big difference?

  10. #10
    LizardRunner's Avatar
    LizardRunner is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default Re: Tire Size and Gear Ratio

    Quote Originally Posted by GreenXJosh View Post
    Nice. Very helpful.
    I am curious if these charts apply to both AW4 and AX15? Does it make a big difference?
    The AX15 has a fourth gear ratio of 1:1, fifth is like fourth in the AW4 1:.075
    2004 4.7v8HO WJ OMG, it's RED , Green bits are now under the hood. Loving the F/R Lockers and D44's. RIP 2011 Lil Ric and Gordo. RIP 2012 Jessie RIP 2013 Kat. RIP 2013 Ed . Lizards can always climb but sometimes they loose their tails to get away. The true patriot will stand beside the soldier when the time comes to fight Now building Asnikiye heca (Buzzard's Roost) homestead farm. My road is my wheeling trail

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    Default Re: Tire Size and Gear Ratio

    Quote Originally Posted by jimwww View Post
    I am running 3.73 with 33x12.5 and I also have an auto tranny - it has a button on the dash that does the pwer vs comfort and that button does work. Not sure what it does but on -power- it works much better. I think it is fine to drive around with those gear ratios and such - what worries me is the brakes. (no emerg stopping for me)
    That button should switch you to hard shift (on) or soft shift (off).
    the way this feature usually works is to change the shift point rpms. Sorta like having two different torque converters in one.
    2004 4.7v8HO WJ OMG, it's RED , Green bits are now under the hood. Loving the F/R Lockers and D44's. RIP 2011 Lil Ric and Gordo. RIP 2012 Jessie RIP 2013 Kat. RIP 2013 Ed . Lizards can always climb but sometimes they loose their tails to get away. The true patriot will stand beside the soldier when the time comes to fight Now building Asnikiye heca (Buzzard's Roost) homestead farm. My road is my wheeling trail

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    Default Re: Tire Size and Gear Ratio

    Hi is this chart with an automatic and what speed is the rpm based on. I have a 94 XJ auto with 33s. what would be the rpm at 65 mph. Thanks

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    Default Re: Tire Size and Gear Ratio

    Quote Originally Posted by Skater28 View Post
    Hi is this chart with an automatic and what speed is the rpm based on. I have a 94 XJ auto with 33s. what would be the rpm at 65 mph. Thanks
    If you notice it says 4th gear. So if it is for an automatic, and I believe it is, it doesn't take into account the 5th gear, which is overdrive. This chart doesn't address speed just tire diameter, great ratio and RPM.

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    Default Re: Tire Size and Gear Ratio

    I believe automatics are 3 speeds and the 4th would be OD.

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    Default Re: Tire Size and Gear Ratio

    Unless otherwise stated, most gear charts assume a 1:1 final ratio.
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