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Old 04-04-2011, 11:18 PM   #1
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Jeep regearing question

I recently bought a 4 in lift and 33x12.5 tires for my 2006 wrangler x 4.0litre I6 6 speed manual transmission because i want a good offroad vehicle but something i can still use as my daily driver. I heard that to save gas mileage and hp u need to regear the differential. The question is what gearing does my stock tj have and what gearing should i go to in order to have what i want? Another question would be how much would it cost to have everything lift,tires and gears put in?

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Old 04-04-2011, 11:24 PM   #2
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X unless it's a rocky mountain came with 3.07 gearing and a dana 35.

4.88's for 35's. Cost about 1200-1600 for regearing. Would recommend swapping the 35 out to a 44 or something else.

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Old 04-04-2011, 11:25 PM   #3
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Doh, you said 33's, 4.56 for gearing. Huge gain back in power.
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Old 04-04-2011, 11:35 PM   #4
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X2 on the 4.56 gears with 33's and 5 spd. I've been running that combo for 6 or 7 years and its great for trails and for hwy. Highly recommend. I also put in a Yukon super 35 kit and an OX locker ate that time and it has worked great too.
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Old 04-04-2011, 11:39 PM   #5
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While 4.56 is my usual ratio recommendation for 33" tires, that is only for the 5-speed transmission. The 6-speed manual transmission is geared so much lower than the 5-speed is that to keep the rpms down, I'd definitely regear it to 4.10.

A typical cost to regear both axles including all parts and labor is going to be $1000 to perhaps $1200 at the most depending on the part of the country it gets done in (affected by labor rates). Any quote higher than that and the shop is just hoping you'll accept the quote without question, so negotiate the price to a more reasonable amount.
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Old 04-05-2011, 01:26 AM   #6
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I know grim jeeper put my 6 speed manual and stock gears on 30" tires about matched perfectly 33" tires and 4.10's but I don't think that takes in account the weight and width. I have 4.88's on 33's and love it. Though I am geared for 35's. I don't have a use for first anymore but I didn't when I had 3.73's and 30" tires either. 4.56 would be just right for the mtns out here. Wonder what 4.10's would be like?
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Old 04-05-2011, 11:52 AM   #7
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Ok so the next question is is there anybody from ny that could recomend a good garage to have this done. I live in upstate ny and i would rather not drive to a different state to have it done.
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Old 04-06-2011, 11:05 AM   #8
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Can your run 33's with 3.73 gears? I have an 05 Rocky Mountain with D44 rear and 3.73 gears. Would like to run 33's but regearing is not in the budget at the moment unfortunately.
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Old 04-06-2011, 11:09 AM   #9
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I'm running 35's on 3.73 gears.. 4L 5spd YJ doing just fine..
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Old 04-06-2011, 11:10 AM   #10
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Quote:
Originally Posted by TJsmitty
Can your run 33's with 3.73 gears? I have an 05 Rocky Mountain with D44 rear and 3.73 gears. Would like to run 33's but regearing is not in the budget at the moment unfortunately.
Sure you can. It will be a bit under powered but it's not too bad. If you find yourself shifting a lot more or pushing the right pedal more, then change the gears.
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Old 04-06-2011, 04:23 PM   #11
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Quote:
Originally Posted by darkproximity
I'm running 35's on 3.73 gears.. 4L 5spd YJ doing just fine..
What your gear ratio on your transfer case?
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Old 04-06-2011, 04:26 PM   #12
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Quote:
Originally Posted by TJsmitty
Can your run 33's with 3.73 gears? I have an 05 Rocky Mountain with D44 rear and 3.73 gears. Would like to run 33's but regearing is not in the budget at the moment unfortunately.
I have that set up right now and say its manageable, but I wouldn't exactly live with it. I'm regearing very soon I already have an estimate for it. Then again everyone has different tolerances so do what you want.
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Old 04-06-2011, 04:29 PM   #13
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Thanks for the info. Its pretty flat around here and most of driving I do is around town so I think I could manage it until the funds allow for a regear. I plan on keeping this TJ for a long time. I just got it with 18,000 miles so lots of life and plenty of time for the more expensive mods down the road.
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Old 04-06-2011, 04:31 PM   #14
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Quote:
Originally Posted by Jerry Bransford View Post
While 4.56 is my usual ratio recommendation for 33" tires, that is only for the 5-speed transmission. The 6-speed manual transmission is geared so much lower than the 5-speed is that to keep the rpms down, I'd definitely regear it to 4.10.
X2 ... But...if you think you may go to 35s eventually 4.56 might be a better choice. I went with 4.10 and 33s with my 6 speed because it put my speedo/odo pretty much right back to perfect, and I doubt I'll ever go to 35s...maybe. In other words 30s with 3.73 = 33s with 4.10.

Even if I go to 35s someday the 4.10s won't be terrible, just not ideal.
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Old 04-06-2011, 05:43 PM   #15
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Quote:
Originally Posted by InvertChaos

I have that set up right now and say its manageable, but I wouldn't exactly live with it. I'm regearing very soon I already have an estimate for it. Then again everyone has different tolerances so do what you want.
I agree 100%. I could not stand having 33's w/3.73 gears and with the area I live in having hills on interstate and all the hwys, i was constantly shifting between 4th and 5th. When I changed to 4.56 it was like adding a supercharger and I can get on the interstate and never need to downshift. I use mine Offroad too and the crawl w 4.56's is excellent. My son has 33's and 3.73's and says he doesn't care if he has to shift a bunch. Different strokes.
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Old 04-06-2011, 05:47 PM   #16
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Originally Posted by schwheelz View Post
what your gear ratio on your transfer case?
2.72:1
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Old 04-06-2011, 06:31 PM   #17
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Quote:
Originally Posted by TexasT

I agree 100%. I could not stand having 33's w/3.73 gears and with the area I live in having hills on interstate and all the hwys, i was constantly shifting between 4th and 5th. When I changed to 4.56 it was like adding a supercharger and I can get on the interstate and never need to downshift. I use mine Offroad too and the crawl w 4.56's is excellent. My son has 33's and 3.73's and says he doesn't care if he has to shift a bunch. Different strokes.
Man I've grown to hate it lol. Around town its nearly lugging at around 1500 rpm and 5th gear is useless on these VA highways where the speed limit is 55mph. Just not fun at all. Especially since I was spoiled with power when I had 235/75/15 A/T tires with 3.73 gearing. I miss that power lol. I have the funds for 4.56's now, but I have to wait for my dad to get back from a business trip to take it to and from the shop as I have school and a job right after school. They should be in by the end of the month though I can't wait!
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Old 04-06-2011, 06:45 PM   #18
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A question please . I have an 04 Wrangler 5 speed with 32-11.50/15 tires and the much loved 3.07 gears . I really don,t have much of a problem (very flat roads) The problem is reverse (it,s fast) to the guys that have regeard how much did it change your reverse speed . This thing will do 30 mph on fast idle in the morning .

Been thinking of 4,10 gears just for this reason .
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Old 04-06-2011, 06:46 PM   #19
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Originally Posted by InvertChaos View Post
Man I've grown to hate it lol. Around town its nearly lugging at around 1500 rpm and 5th gear is useless on these VA highways where the speed limit is 55mph. Just not fun at all. Especially since I was spoiled with power when I had 235/75/15 A/T tires with 3.73 gearing. I miss that power lol. I have the funds for 4.56's now, but I have to wait for my dad to get back from a business trip to take it to and from the shop as I have school and a job right after school. They should be in by the end of the month though I can't wait!
I love your statement...I've grown to hate it....
You will not regret it and your mileage will probably increase too.
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Old 04-06-2011, 06:49 PM   #20
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Originally Posted by BANGER View Post
A question please . I have an 04 Wrangler 5 speed with 32-11.50/15 tires and the much loved 3.07 gears . I really don,t have much of a problem (very flat roads) The problem is reverse (it,s fast) to the guys that have regeard how much did it change your reverse speed . This thing will do 30 mph on fast idle in the morning .

Been thinking of 4,10 gears just for this reason .
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Regearing will slow the Jeep at any given rpm in both forward and reverse.
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Old 04-06-2011, 06:51 PM   #21
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There is a great site that you can put in the setup you have and right next to it you can put what you want and then compare. It asks for your gear ratios but it also has the name of the transmissions and tcase options so you don't need the actual gear ratios. It is a great place to compare how gears will effect lo and high range as well as crawl speeds and hwy speeds. It also has reverse gear comparison too.
Play with it a bit and see what your rig could be.
Gear Ratio Calculator
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Old 04-06-2011, 06:59 PM   #22
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Thanks Jerry that was just what I already knew . I also know 4.88 would be slower in reverse at idle then 4.10,s .
The question was/should of been how much difference did you really see after a gear change . (3.07 TO 4.10)

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Old 04-06-2011, 07:01 PM   #23
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It'll be roughly 1/3 slower at the same rpms with 4.10 vs. 3.07. Somewhat dramatic in other words.
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Old 04-06-2011, 07:13 PM   #24
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Jerry thanks that does help . I hate to spend any money I don,t need to and if reverse was not so tall I would not mess with it .

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Old 04-06-2011, 07:14 PM   #25
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Quote:
Originally Posted by TexasT
There is a great site that you can put in the setup you have and right next to it you can put what you want and then compare. It asks for your gear ratios but it also has the name of the transmissions and tcase options so you don't need the actual gear ratios. It is a great place to compare how gears will effect lo and high range as well as crawl speeds and hwy speeds. It also has reverse gear comparison too.
Play with it a bit and see what your rig could be.
Gear Ratio Calculator
Question: I've played with numerous calculators but sometimes a first hand opinion is the best. What rpm are you running at 60mph in 5th gear?
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Old 04-06-2011, 07:38 PM   #26
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At 60 mph I,m running around 1600 rpm,s . As I stated it,s flat and the jeep holds it well . I very unhappy with how fast the reverse is otherwise I would not regear .

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Old 04-06-2011, 07:42 PM   #27
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Originally Posted by InvertChaos View Post
Question: I've played with numerous calculators but sometimes a first hand opinion is the best. What rpm are you running at 60mph in 5th gear?
65 is right at 2200 rpm but I'll have to look at 60 tomorrow and post it.
I just put my numbers in that calculator and it came out the same as what I am actually getting so for that setup it is pretty close. I live on some very rugged Texas hills and only need to go 20 feet or so from the garage to my test area and the best part of the 4.56 gears is the crawling. I would love to put in a 4:1 in my tcase but I think it would be way toooo low.
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Old 04-06-2011, 07:51 PM   #28
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Okay my TJ I had was the 2.5 ran 32's with no loss, a 4.10 set up cheap should work. It's a Jeep gas always sucks but I am running a 95 YJ with 31's and only use 4th as the PO killed 5th I get 15 mpg and at 60 I am turning almost 3K it is probably 26 to 28K and has 4.10's.

Don't know if this helps but just thought I would throw some numbers at you.
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Old 04-06-2011, 09:22 PM   #29
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Question: I've played with numerous calculators but sometimes a first hand opinion is the best. What rpm are you running at 60mph in 5th gear?
Had to run to the store and was able to hit 60 once (very windy country road) and it was right at 2000 at 60mph
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Old 04-06-2011, 09:26 PM   #30
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Originally Posted by TexasT

Had to run to the store and was able to hit 60 once (very windy country road) and it was right at 2000 at 60mph
Alright sweet thanks for checking on that. That sounds perfect for me. A lot better than 1600rpm. The thing just dies on hills or if there is any wind. I can't wait to regear now. You didn't happen to notice what rpm you were running at 25mph did you? I'm guessing around 1800-1900 in 3rd? If not don't worry about it.

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