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Old 02-02-2013, 03:05 PM   #1
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Is re-gearing necessary??

Im eventually going to do a 2.5" lift and 33 x 10.5s on my '04 TJ, and been reading alot about having to re-gear my axles. Is this a necessity? Im not a hardcore rockcrawling type, just a take the family out in the hills type. This is also my daily driver.

Thoughts?

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Old 02-02-2013, 03:16 PM   #2
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All depends on the gearing you have now. If you have 3.73s, going to 33s won't be as drastric of an experience as if you had 3.21 sor 3.07s. First determine what you have and then look at some of the numerous gearing calculators on the net to determine where you want to be.

Where you want to be is also based a lot on whether it is man or auto trans. Below is an image of just "one" of many gear charts out there.



Good luck. Personly I would regear for the next highest tires (35s), just incase you want to go higher. Mileage will never be you friend in a Jeep. Accept it and plan for future builds.

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Old 02-02-2013, 03:47 PM   #3
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Be wary of such charts, they only provide part of the answer and they have misled more than a few Jeepers. That type of chart only shows the RPMs when the transmission is in its 1:1 ratio gear. That means the chart is showing what RPMs you'd get when you're in 4th gear if you have the 5-speed, 5th gear if you have the 6-speed, or with the Overdrive turned off if you have the 4-speed automatic.... but NOT the RPMs you would actually have on the highway once you're cruising.

So those RPMs usually scare most Jeepers into undergearing their Jeeps in a misguided attempt to hold the RPMs down but the end up with much lower RPMs than are actually needed. Not to mention the correct axle ratio depends as much on the engine type... 4, 6, or 8 cylinder as much as it does on the transmission type. So you can see why such charts are misleading at best, downright wrong at worst.

JeepReaper09, to know the right gear ratio to recommend and to know how badly you'll need to regear, we'll need to know your engine type, your model year, and what transmission you have... or your transmission type if you don't know its exact model.
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Old 02-02-2013, 03:49 PM   #4
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How do I find out my CURRENT gears?
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Old 02-02-2013, 03:51 PM   #5
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Originally Posted by JeepReaper09 View Post
Is this a necessity? Im not a hardcore rockcrawling type, just a take the family out in the hills type. This is also my daily driver.
regearing your axles has less to do with rock crawling and more to do with highway & street driving.
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Old 02-02-2013, 03:52 PM   #6
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How do I find out my CURRENT gears?
Your ratio will be stamped into the steel tag located at the 9 o'clock position on your differential covers.

The tag shown below is indicating the axle has 3.73 gearing inside...
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Old 02-02-2013, 03:55 PM   #7
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Your ratio will be stamped it to the steel tag located at the 9 o'clock position on your differential covers.

The tag shown below is indicating the axle has 3.73 gearing inside...
Only problem.....PO put stainless diff covers.....no tag on there. Btw....I have a 99 TJ with a 2.5 L and manual trans. Also, sorry to hijack the thread.
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Old 02-02-2013, 03:55 PM   #8
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RPM at a 60 or 70 mph "gps" speed reading and tire diameter and I can tell you what you have if I know your trans and what gear your in.
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Old 02-02-2013, 03:56 PM   #9
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Only problem.....PO put stainless diff covers.....no tag on there. Btw....I have a 99 TJ with a 2.5 L and manual trans. Also, sorry to hijack the thread.
Your most likely 4.10 that stock.
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Old 02-02-2013, 03:58 PM   #10
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Your most likely 4.10 that stock.
5th gear, at 70 mph, is right at 3000 rpm. I currently have 31s.
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Old 02-02-2013, 03:59 PM   #11
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Your most likely 4.10 that stock.
Yep, 4.10/4.11 are the two axle ratios (front & rear ratios are .01 different) when you have the 2.5L engine and 5-speed transmission.
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Old 02-02-2013, 04:05 PM   #12
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Originally Posted by Jerry Bransford
Yep, 4.10/4.11 are the two axle ratios (front & rear ratios are .01 different) when you have the 2.5L engine and 5-speed transmission.
Think I can get away with 32s? Will 5th gear be a memory?
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Old 02-02-2013, 04:06 PM   #13
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JeepReaper09, If your 04 X has the auto in it (42rle for 03+ TJ's), you will hate it with stock gears and 33" tires. The good new is you will have 3.73 gears with the auto and you will not have to buy a new carrier in the front to re-gear where you need it.

I ran for awhile with stock 3.73 gears, 42rle auto, and 33" tires on my 04 X. You just have to hit the "OD off" button every time you start it. It will work for on road. It's not having a low enough gear to slow down on very steep off road down hill sections that really bites. 4.88's is recommended for that combo.... that is assuming you have an automatic.

Nice Jeep BTW. That's how I started, totally stock unmolested 04 X. I did not have to worry about other people's mess ups. I have plenty of my own to deal with. But, I know everything that has been done to the Jeep.
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Old 02-02-2013, 04:13 PM   #14
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5th gear, at 70 mph, is right at 3000 rpm. I currently have 31s.
Is that gps or speedo?
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Old 02-02-2013, 04:17 PM   #15
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Is that gps or speedo?
Speedo....
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Old 02-02-2013, 04:20 PM   #16
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Thoughts?

If you can at all afford it ... DO IT.


Quote:
Originally Posted by UnlimitedLJ04 View Post
regearing your axles has less to do with rock crawling and more to do with highway & street driving.

^ this right here
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Old 02-02-2013, 04:28 PM   #17
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Speedo could be way off or right on. You just don't know. If you have a smart phone you can get a GPS app for free and then run it. Then you can tell what you have for gears.
For a 2.5 with the AX5 fifth gear at .85 x 4.10= 3.48 to 1 and a 31 inch tire at 3000 you should be running 78 MPH.
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Old 02-02-2013, 04:41 PM   #18
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70 on my speedo = 77 on my iPhone.
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Old 02-02-2013, 04:56 PM   #19
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JeepReaper09, If your 04 X has the auto in it (42rle for 03+ TJ's), you will hate it with stock gears and 33" tires. The good new is you will have 3.73 gears with the auto and you will not have to buy a new carrier in the front to re-gear where you need it.

I ran for awhile with stock 3.73 gears, 42rle auto, and 33" tires on my 04 X. You just have to hit the "OD off" button every time you start it. It will work for on road. It's not having a low enough gear to slow down on very steep off road down hill sections that really bites. 4.88's is recommended for that combo.... that is assuming you have an automatic.

Nice Jeep BTW. That's how I started, totally stock unmolested 04 X. I did not have to worry about other people's mess ups. I have plenty of my own to deal with. But, I know everything that has been done to the Jeep.
I do have an automatic, and will have to check what my gear ratio is on the diff.

It will still be a little while before this happens, but it's on the list.

Thanks for the compliments on the jeep. my first vehicle was a '79 CJ 7 and absolutely loved tinkering with it, but unfortunately had to get rid of it. So extremely happy to have another jeep in the garage.
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Old 02-02-2013, 04:59 PM   #20
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I do have an automatic, and will have to check what my gear ratio is on the diff.
At least that makes the ratio recommendation possible now... your automatic is the 4-speed 42RLE and for 33" tires, 4.88 will be ideal. That 4.88 might sound like it's too low of a ratio but for your particular transmission with its .69 OD ratio, 4.88 is what you want. Your engine RPMs would be too low with 4.56 and the engine would be lugging with your particular transmission.
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Old 02-02-2013, 04:59 PM   #21
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I do have an automatic, and will have to check what my gear ratio is on the diff.
Well, unless the previous owner had it re-geared, it will have 3.73's in it.

Good to have you back in your totally hi-jacked thread.

...and a Jeep.
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Old 02-02-2013, 05:04 PM   #22
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Hey hijacked or not great info from you guys. Definitely appreciate it.

Would it's be a bad idea to regear before I get the new additions or wait til I actually do the lift and tires? Trying to figure out how to go about this without killing my wallet more then I need to.
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Old 02-02-2013, 05:09 PM   #23
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That depends on how long you'd be on the 4.88 gears before installing the 33" tires.

By the way, 2.5" of suspension lift won't provide enough clearance for those 33" tires. I'd add a 1" or 1.25" body lift to the 2.5" suspension lift to provide sufficient clearance.
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Old 02-02-2013, 05:11 PM   #24
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It's on the list as well... a 1.25" BL. Among many many other things haha. I may just purchase the gears and just have them on hand while I save a few pennies to get my tires. Thanks for the help.
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Old 02-02-2013, 05:14 PM   #25
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Don't purchase the gears & master install kits ahead of time in a misguided attempt to save $$$. Have the installing shop provide ALL PARTS or if there's a problem, they'll just blame your parts & you'll be stuck in the middle of getting them replaced. The dealer you bought the gears from will blame the installer who is usually at fault, & the shop will just say they had a flaw in them & not accept any responsibility.

The good news is most installing shops will discount the cost of parts if you ask them to since most of their profit is on the labor anyway. Having them provide everything will mean there will be no questions asked if something goes wrong after the installation. And with ring & pinion installations, things sometimes go wrong... it has happened to me.
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Old 02-02-2013, 05:23 PM   #26
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Well since there aren't any (that I have found yet, only lived here since August ) 4x4 shops around here I was planning on installing myself. I have basic knowledge of how to work on vehicles, and would have a little more pride in doing it myself. Well doing as much as I can myself then asking for help when the jeep is in a million pieces and I am lost. This is usually how things work with me anyhow. Haha
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Old 02-02-2013, 05:36 PM   #27
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Originally Posted by TJDave

Well, unless the previous owner had it re-geared, it will have 3.73's in it.

Good to have you back in your totally hi-jacked thread.

...and a Jeep.
Well excuse me....figured jeep info would be open to ALL on this site. To the OP, my apologies.
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Old 02-02-2013, 05:41 PM   #28
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lots of great information on this thread. Now i have to rethink how i want to regear my jeep. i have a 1997 tj manual I6 stock but i want to run 35''s.
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Old 02-02-2013, 05:58 PM   #29
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Well excuse me....figured jeep info would be open to ALL on this site. To the OP, my apologies....to the smarty pants, bite me.
You got 4.10s my friend.
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Old 02-02-2013, 06:00 PM   #30
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You got 4.10s my friend.
Thank you, sir....and congrats on the weigh loss.

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