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post #1 of 18 Old 03-19-2007, 09:23 PM Thread Starter
baudencm
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Re-gear

I posted this in the drivetrain section, thought I'd try here as well.

I think I have 3.07 gear ratio in my 99 TJ which kinda sucks from what I read. I have 31x10.5's right now but would like 32's or 33's. What's a re-gearing cost? Is it worth it? What should i go to? I've heard its not really a weekend warrior job. My 5th gear seems pretty usable currently...

CB

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post #2 of 18 Old 03-19-2007, 09:28 PM
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First off figure out what gears you have for sure. There is a big difference between 3.07 and 3.73's. Believe me, my 32's with 3.73's are a HUGE difference from a buddy with 33's and 3.07's! The labor on a regear on your D30 and D35 will run about $500ish and parts depend on where you get them from. If you are gonna wheel it regularly or you are hard on the gas I would recommend upgrading the rear axle to an 8.8 or D44. If you just wheel occasionally or are light on the gas and wont go over 33's just regear the D30 and D35 and be done with it. Remember if you want a locker, do it when you regear the first time since case lockers require a new gear set up. HTH and it makes sense!

-Matt
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post #3 of 18 Old 03-19-2007, 09:30 PM
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if your going to goto 33s, 4.56 would be good.

It'll run you in the neighborhood of $1,000

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post #4 of 18 Old 03-19-2007, 09:32 PM
Beaverwrangler
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You can get buy for a while... but you will eventually need to
regear for the sake of your clutch and having enough torque
to be functional in 4x4....

I've been running on skinny 33's with 3.07's and 5speed on my
1999 till I could find a suitable rear axle to swap in.... It was very
livable (with skinny 33's anyways) on the highway — 5th will still
hold 75 on flat ground but it's not good long term....

I'm getting 4.56's and a ford 9" next week and I am really looking
forward to it...

Until you regear you will need 4low all the time which is really hard
on your transfer case... so try to regear ASAP...

Heavy, wide 33's like swampers would be horrible....
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post #5 of 18 Old 03-19-2007, 09:57 PM Thread Starter
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Well the reason i got into this whole thing is that I was adjusting my speedometer. (aka speedo gear) According to the chart, I needed a 33 tooth gear for my 31" tires and 3.73 gear ratio. Well I installed a 33 tooth gear and checked it with a gps and I was about 8-10 mph slow. The stock speedo gear was a 30 tooth gear. I put that back in and checked it with gps and was about 3-5 off. So basically I would need like a 28 or so tooth speedo gear to be correct with my 31 inch tires. Looking at the chart, I would conclude I have 3.07 gears. Am I crazy with this conclusion? Yeah I will look on the diff tomorrow and see if I can read the label on the cover for double check. Regardless, an upgraded axle would be sweet with 33's. Lot of moolah though.
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post #6 of 18 Old 03-19-2007, 10:07 PM
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Quote:
Originally Posted by baudencm
Well the reason i got into this whole thing is that I was adjusting my speedometer. (aka speedo gear) According to the chart, I needed a 33 tooth gear for my 31" tires and 3.73 gear ratio. Well I installed a 33 tooth gear and checked it with a gps and I was about 8-10 mph slow. The stock speedo gear was a 30 tooth gear. I put that back in and checked it with gps and was about 3-5 off. So basically I would need like a 28 or so tooth speedo gear to be correct with my 31 inch tires. Looking at the chart, I would conclude I have 3.07 gears. Am I crazy with this conclusion? Yeah I will look on the diff tomorrow and see if I can read the label on the cover for double check.
If you had stock 3.73s, 31s would be almost perfect on the speedometer with the stock speedo gear

My 3.73s and 31s, with my speedometer compared against both highway mileage signs, and police radar guns, is damn near accurate.

According to this chart, if you had 3.07s you'd need a 32 tooth
http://www.quadratec.com/jeep_knowle...article-46.htm

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post #7 of 18 Old 03-19-2007, 10:58 PM
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Quote:
Originally Posted by Beaverwrangler
Until you regear you will need 4low all the time which is really hard on your transfer case... so try to regear ASAP...
Please explain.
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post #8 of 18 Old 03-20-2007, 06:50 AM
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Quote:
Originally Posted by SecondTJ
if your going to goto 33s, 4.56 would be good.

It'll run you in the neighborhood of $1,000
Agree with this totally.

Scott

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post #9 of 18 Old 03-20-2007, 08:06 AM Thread Starter
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Whats a Dana 44 usually run? If I'm gonna spend a grand, is a new better axle that much more? Used is fine with me.
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post #10 of 18 Old 03-20-2007, 08:55 AM
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Quote:
Originally Posted by baudencm
I posted this in the drivetrain section, thought I'd try here as well.

I think I have 3.07 gear ratio in my 99 TJ which kinda sucks from what I read. I have 31x10.5's right now but would like 32's or 33's. What's a re-gearing cost? Is it worth it? What should i go to? I've heard its not really a weekend warrior job. My 5th gear seems pretty usable currently...

CB
You have an auto, correct? I have(had) a 99 auto with 3.07. I just replaced both front and rear diffs, pulled the 4.0 and replaced with a 4.6 stroker and geared to 4.56. I run 33's. This is great for the trail, and I can climb a tree but if you wish to run on the highway, 4.56 and 33" will place you at about 3200 rpms at 65mph. I changed my speedo gear to a 40tooth as well. All the calculators say to run a 39 or 37 and you will be at 3000rpm at 65. These calcs were written for manuals and your auto will run a bit higher becasue of the slippage of the torque converter. Even in lockup this is the speed and RPMs I see.

From the many things I've read on the internet, I think 4.10 or 3.73 would have made a good selection for the highway. I chose 4.56 so that if I wanted to jump to a 35 or 37 tire, it would have still performed well.

I have verified my speedo is correct with my GPS... and its a newer model.
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post #11 of 18 Old 03-20-2007, 08:58 AM
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Quote:
Originally Posted by baudencm
Whats a Dana 44 usually run? If I'm gonna spend a grand, is a new better axle that much more? Used is fine with me.

The regear will cost you probably $300-$500 per axle. The 44 would depend or new or used. I paid a pretty penny but put in new D44 rear housing and components and new Rubi44 front and components.
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post #12 of 18 Old 03-20-2007, 09:16 AM
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4.56 with a manual. That's what I have with 33's. Works great. Runs 2500 RPMs at 65 mph with a 39 tooth correct speedometer gear installed. You can actually accelerate in 5th gear if needed.

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OME HD Kit,JKS BMML,1.25 JKS BL, adj. control arms
RE Generation II Quick Discos
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D44 rear axle w/ ARB, alloy shafts, 4.56 gears
Dana 30 with ARB, 4.56 gears, alloy shafts and ujoints
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post #13 of 18 Old 03-20-2007, 09:24 AM Thread Starter
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Quote:
Originally Posted by tjstroker
You have an auto, correct? I have(had) a 99 auto with 3.07. I just replaced both front and rear diffs, pulled the 4.0 and replaced with a 4.6 stroker and geared to 4.56. I run 33's. This is great for the trail, and I can climb a tree but if you wish to run on the highway, 4.56 and 33" will place you at about 3200 rpms at 65mph. I changed my speedo gear to a 40tooth as well. All the calculators say to run a 39 or 37 and you will be at 3000rpm at 65. These calcs were written for manuals and your auto will run a bit higher becasue of the slippage of the torque converter. Even in lockup this is the speed and RPMs I see.

From the many things I've read on the internet, I think 4.10 or 3.73 would have made a good selection for the highway. I chose 4.56 so that if I wanted to jump to a 35 or 37 tire, it would have still performed well.

I have verified my speedo is correct with my GPS... and its a newer model.

No I have a 5 speed manual. Was there a reason you thought I had an auto? Just curious...
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post #14 of 18 Old 03-20-2007, 09:55 AM
tjstroker
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Quote:
Originally Posted by baudencm
No I have a 5 speed manual. Was there a reason you thought I had an auto? Just curious...

Yes, from all the things I have read while researching my upgrades the 3.07 was placed into the autos and 3.73 was placed into the manuals....
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post #15 of 18 Old 03-20-2007, 10:15 AM
Dogman
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Nope, tons of people with 3.07 and the 5 speed. I used to be one of them

To the OP, 4.56 is a highly recommended ratio for the 5 speed, 4.0 and 33s.

John 3:17
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