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Old 04-21-2012, 10:50 AM   #1
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33" tires best gearing ?

Have 3:07's now looking to regear, Would 4:10 or 4:56's be best.

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Old 04-21-2012, 10:51 AM   #2
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What engine and transmission?

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Old 04-21-2012, 11:49 AM   #3
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On my 97 I have a 4.0, AX15 Manual and running BFG's 33 x 10.5"s. 4.56 seemed to work for me. Slight loss in fuel economy but a lot more power where it counts. I spend much more time in 4th and 5th gear than I used to with 3.07's. But, like Jerry said what is your engine and tranny setup?
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Old 04-21-2012, 07:43 PM   #4
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Sorry for butting in but i`am running the 241 transfer case,42rle tran,with the 4.0 motor it`s all in my rubi,I`AM LOOKING at the 33`s also. do i need to regear my unlimited rubi... and if so what ratio??
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Old 04-21-2012, 07:47 PM   #5
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The 33" tire/42RLE combination does best with 4.88 (yes) gearing. That particular automatic transmission has such a low 4th gear (Overdrive) ratio, .69, that it needs a lower ratio axle ratio. You'd be undergeared with 4.56 and it'd be lugging. 4.88 is just right.

I bought my second TJ used from a friend and it came with 4.88 gears with 35" tires and the engine lugs at 65-70 mph, it should have been regeared to 5.13 or 5.38 and the previous owner (Gerald from Savvy) agrees he made a mistake only gearing it to 4.88 for the 35" tires. My Overdrive on-off button is gonna wear out one of these days.
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Old 04-21-2012, 10:25 PM   #6
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jerry, what gearing will be the best for me?
I have a 2002 sport automatic, nos shure what transmission. rear d44. Sport model
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Old 04-21-2012, 10:31 PM   #7
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jerry, what gearing will be the best for me?
I have a 2002 sport automatic, nos shure what transmission. rear d44. Sport model
32rh 3 speed auto.. What size tire you looking to regear for? 33's or 35's?

Sorry my name isn't Jerry
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Old 04-21-2012, 10:55 PM   #8
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I have the 4.0L 3spd auto and 33x12.50x15 Duratracs with the 3.07 gears. I didn't notice a powerloss when I changed to the 33's, (unless I'm towing a trailer up steep hills) but I don't have the over drive gear either. I did lose some mpg, it went from 19mpg to 16mpg.
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Old 04-21-2012, 11:14 PM   #9
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32rh 3 speed auto.. What size tire you looking to regear for? 33's or 35's?

Sorry my name isn't Jerry
no problem.

33's!
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Old 04-21-2012, 11:25 PM   #10
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no problem.

33's!
4.10 would be ideal for 33" tires and your 3-speed automatic.
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Old 04-21-2012, 11:35 PM   #11
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4.10 would be ideal for 33" tires and your 3-speed automatic.
Sorry TX distracted by hockey.. ^ What Jerry Said ^
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Old 04-21-2012, 11:44 PM   #12
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Thanks.!
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Old 05-20-2012, 12:10 AM   #13
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4.0 and 5 speed
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Old 05-20-2012, 01:02 AM   #14
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4.0 and 5 speed
In that case, 4.56 is the preferred gear ratio.
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Old 05-20-2012, 01:22 AM   #15
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Im looking at 33s as well. But I have a 06 2.4L 6 speed. What would be best?
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Old 05-20-2012, 01:54 AM   #16
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If you google it, you will find a chart that shows you exactly what gears you need and the rpms as well for each tire size.
Tire & Gear Ratio Chart at Morris 4x4 Center
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Old 05-20-2012, 10:07 AM   #17
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If you google it, you will find a chart that shows you exactly what gears you need and the rpms as well for each tire size.
Tire & Gear Ratio Chart at Morris 4x4 Center
Such charts aren't for inexperienced people to interpret because the RPMs they show invariably scare them.

Those charts only show the RPMs obtained at a 1:1 drive ratio which would be 4th gear with a 5-speed transmission, 5th gear with a 6-speed transmission, or with the Overdrive turned off with the 4-speed automatic. In reality, cruising RPMs are substantially lower than what those charts show because you still have another gear left to shift into after those RPMs are reached.

Charts like that one have caused a lot of inexperienced people to undergear their Jeeps with the wrong ratio. For example, that chart says you will get 3045 RPMs at 65 mph with 35" tires and a 4.88 ratio which is crazy high.

In reality, my previous 5-speed got around 2700 RPMs and my current 4-speed automatic is right at 2100 RPMs at 65 MPH with that tire size and 4.88 ratio. Yes such charts include a disclaimer in small writing saying the actual RPMs may be higher or lower but the newbies don't really understand that and all they really see are the RPMs that will invariably be higher than what they'd really get.

For that reason, I never give out charts like that because they just scare anyone who is inexperienced.
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Old 05-20-2012, 10:34 AM   #18
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Im looking at 33s as well. But I have a 06 2.4L 6 speed. What would be best?
I don't have a four cylinder, but from what I understand 4.88 is the proper gear ratio for you. Maybe someone with a four banger can confirm this?

EDIT: Then again, maybe you can get away with 4.56s since you have a 6 speed???
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Old 05-20-2012, 11:06 AM   #19
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Originally Posted by Jerry Bransford View Post
Such charts aren't for inexperienced people to interpret because the RPMs they show invariably scare them.

Those charts only show the RPMs obtained at a 1:1 drive ratio which would be 4th gear with a 5-speed transmission, 5th gear with a 6-speed transmission, or with the Overdrive turned off with the 4-speed automatic. In reality, cruising RPMs are substantially lower than what those charts show because you still have another gear left to shift into after those RPMs are reached.

Charts like that one have caused a lot of inexperienced people to undergear their Jeeps with the wrong ratio. For example, that chart says you will get 3045 RPMs at 65 mph with 35" tires and a 4.88 ratio which is crazy high.

In reality, my previous 5-speed got around 2700 RPMs and my current 4-speed automatic is right at 2100 RPMs at 65 MPH with that tire size and 4.88 ratio. Yes such charts include a disclaimer in small writing saying the actual RPMs may be higher or lower but the newbies don't really understand that and all they really see are the RPMs that will invariably be higher than what they'd really get.

For that reason, I never give out charts like that because they just scare anyone who is inexperienced.
That is very helpful info for people that do not fully understand gear ratios.
Thank you very much..
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Old 05-20-2012, 01:21 PM   #20
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X2, very helpful.
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Old 05-21-2012, 09:31 AM   #21
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How about a 06 4.0 6 speed manual?
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Old 09-27-2012, 09:34 PM   #22
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i have a 02 TJ sport, 4.0L 5 speed manual. 4 inch procomp short arm lift and 33's, i have a D44 rear and HP D30 front its geared to 3.73 i kno not ideal but it works fine for me.. ill regear as soon as i get home from deployment!
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Old 09-27-2012, 10:05 PM   #23
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hey guys I'm new into all these gears stuff. i got a 05 4.0 6 speed trans. front i got d30 and d35 rear. I'm willing to swap to a ford 8.8, on the 8.8 i got 373 gears, and its a limited slip also, but i dont know whats the right gears i need to have. any advice? i think i got a 3.73 on my rear d35. i also have 33x10.5x15.
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Old 09-28-2012, 06:22 AM   #24
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Im looking at 33s as well. But I have a 06 2.4L 6 speed. What would be best?
A turbo
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Old 09-28-2012, 06:27 AM   #25
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I have a 4.0 i6 5 spd with 33's and 4:56 gears all I gotta say is wow but then again I've put other mods into it I hardly ever hav to use 4L
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Old 09-28-2012, 09:19 AM   #26
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I hardly ever have to use 4L
It's time to find some tougher trails.
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Old 09-28-2012, 10:46 AM   #27
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A turbo
Id rather get a small block at that point...
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Old 09-28-2012, 10:56 AM   #28
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When I think about which gear ratio shoukd I Put just use simple maths, asuming near to stock ratio would be the ideal, as simple as this :

original gear x new tire size /original tire size
Eg: 33 x 4,11 / 27 = 5,02. Now assuming that I drive 30" on stock 4.11, there should be no problem with a 10% tollerance, so you could put 4,56 and works fine, but considering a bigger tire equals more weight and requires a lot more energy to change its momentum, as bigger the tire smaller the margin, so in this case i would use 4,88.
Hope its useful!
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Old 10-29-2012, 02:17 PM   #29
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Think I can get away with my Dana 44 / 3.73 combo with 33s (285/75/16) or do you think I will be sorry? Second choice is 265/75/16 (31.7) but sure looks small with my 3" lift.

Oh sorry... 2001 4.0/ 3spd auto
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Old 10-29-2012, 02:26 PM   #30
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Think I can get away with my Dana 44 / 3.73 combo with 33s (285/75/16) or do you think I will be sorry? Second choice is 265/75/16 (31.7) but sure looks small with my 3" lift.

Oh sorry... 2001 4.0/ 3spd auto
You didn't tell us which transmission you have, but yes, I do think you'll be sorry running that combo. I ran it for about two years and it sucked with my NV3550.

If you have a manual tranny like I had, you'll want 4.56s (provided you don't want to go to larger tires in the future). If you have a three speed auto tranny, the right gears for you would be 4.10s. If it's a trail-only vehicle, you'll be better off getting even lower gears.

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