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Old 04-19-2009, 04:54 PM   #1
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Re-gearing questions.

I'm looking to re-gear my 99 TJ Sport, 32RH, dana 30/35s and 33s. The thing is super slow and I feel like I need to floor it to get it moving. I "think" I'm running 3.07 gears right now, but I need to double check. I'm pretty mechanically inclined so and have a good amount of tools in the garage (just changed the CV assemble and u-joints last week).

I have a few questions:
1. Where is the best place to purchase the gears and how much should they cost me?
2. Do I need to purchase anything else when changing the gears?
3. What gearing is recommended for my setup? I've done some research and it looks like 4.10 seems to be the popular choice. FYI - I'm not looking to go bigger on the tires. This is my DD and I don't go wheeling that often.
4. Any other tips/suggestions before I take on this project?

Thanks in advance!

-Maciek

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Old 04-19-2009, 05:06 PM   #2
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Check around for the prices. (4wd.com, google search, etc.)

Your going to need all of the mics and gauges to do it correctly.

I have 3.73's in mine and i'm running 35's, not the greatest on the street but i do like it. So 4.10's might be a little high for your taste if it's going to be all street. Try to drive someone's with different gearing if you can.

Just remember it's not easy at all to re-gear but it's worth the time and effort to do it yourself because shops charge an arm, a leg, a first born child, etc.

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Old 04-19-2009, 05:16 PM   #3
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4.10 lower gear than 3.73
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Old 04-19-2009, 05:20 PM   #4
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i'd do 4.10's or even 4.56

but, it is not a diy job. and most mechanics don't even have the tools to do it right. i have over 2 grand in special tools just for gear set up, not including a shop press. pinion depth gauge, dial indicator in/lb torque wrench, bearing splitter, regular dial indicator, axle puller and so on.

if you do not set them up correctly, they will fail, and all your money was wasted. if terms like bearing preload, backlash, and gear pattern aren't in your arsenal, this is one job to leave to a professional. and i will recomend and help anyone to tackle jobs on their own, just not gears.

and like i said, most mechanics aren't good at ring and pinion install, so make sure where you're going knows what they're doing. some people have luck setting them up "by feel" but thats all it is, luck.
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Old 04-19-2009, 05:20 PM   #5
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Chech these out. (Simple google/jeepforum/pirate4x4 search)

Pirate4x4.Com - The largest off roading website in the world.

randysring&pinion.com

My Jeep Cherokee Sport - Rear Regear (Chrysler 8.25)
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Old 04-19-2009, 05:37 PM   #6
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X2 on having someone do it if you've never done it before. !

I've helped someone do it that really knew what they were doing and it was tough.
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Old 04-19-2009, 05:49 PM   #7
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I have 4.88's, but then again I'm running with the low output 4 banger. i didn't notice much difference at slow speeds, but at highway speeds of 45mph and above I have a lot more pedal left in 5th gear.
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Old 04-19-2009, 06:04 PM   #8
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Looks like I didn't do enough research.

This leads into another question: Would it be easier to just find different axles already re-geared?
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Old 04-19-2009, 06:05 PM   #9
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Like Dave said, most mechanics don't do their own gears. It's not that it is extremely difficult. It's just that it is very time consuming and you REALLY have to know what your doing. Otherwise it will fail. To give you a rough idea, I had my front axle out and on stands and half tore down the night before and it still took me about 8 hours to get it set up right. And that isn't putting it back on the jeep. That is just getting the gears done and the cover put back on.

As for what gears to get I would have to recommend 3.73 or 4.10 for a daily driver on 33's. But each person likes to have things a certain way so in the end it is what you would prefer. Here are a couple gear calculators for you to play with to help make up your mind.
Gear Ratio Calculator
4Lo.com :: Final Gear Ratio, Crawl Ratio, Tire Size Calculators

There are a few different brands of gears. Spicer, Superior Gear and Axle, Precision Gear, Yukon....The list goes on. Any of them will do just fine. You can get them at Randy's Ring and Pinion, Summit Racing, 4WD.com. Quadratec, Tellico 4x4, 4 Wheel Parts and eBay. Although I would avoid the last one.

When you get a ring and pinion set you will also need an install kit for each axle if they don't come with it. One that includes all the shims and all new bearings. You'll need a kit for each axle. The install kits usually run between $100-$200 depending on the vendor, per axle. I've seen gears go from $150 to about $325 per axle.


SO..., with all that in mind, if you still want to tackle the job here are a few web pages that will help you through.
Free Automotive Differential Ring and Pinion Gear Installation Instructions - Drivetrain.com
Setting Up a Differential Ring


And one tool that I used that saved a bunch of time is a dremel tool and a tungsten carbide cutter like this.
Craftsman Tungsten Carbide Cutter - Model 53071 at Sears.com
It works wonders when you have to hone out the inside of the old bearings to make a set of setup bearings. And it has to be tungsten carbide. None of those cheap ones are hard enough and they won't last 20 seconds against one of those bearings.
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Old 04-19-2009, 06:09 PM   #10
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No. Don't go hunting around for a set of axles with the gears you want. First you'll probably spend even more money in the end. And second, you don't know what those axles have been through or who might have messed with the gears. Your better off with what you've got, even if you have to pay someone to install them for you. And it is a good idea to overhaul a donor or wrecking yard axle before putting it in anyways so you'll be tearing down and building up what ever set of axles you find anyways so just keep what you got and change the gears.
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Old 04-19-2009, 06:27 PM   #11
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Thanks for the input. This is exactly the type of info I was looking for. I'm going to start hunting around for shops in the area and get some prices.
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Old 04-19-2009, 07:08 PM   #12
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Thanks for the input. This is exactly the type of info I was looking for. I'm going to start hunting around for shops in the area and get some prices.
cool, keep in mind every shop you ask is gonna say "oh yeah, we can install your ring and pinion, no prob." that doesn't mean they can. they just won't turn down any work. tell me where you're at and i may be able to help you out w/ some places, i'm north of chicago but i also know some people around chicago.
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Old 04-19-2009, 08:55 PM   #13
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cool, keep in mind every shop you ask is gonna say "oh yeah, we can install your ring and pinion, no prob." that doesn't mean they can. they just won't turn down any work. tell me where you're at and i may be able to help you out w/ some places, i'm north of chicago but i also know some people around chicago.
NW Side - Addison/Cumberland area.

How much do you think a job like this would run?
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Old 04-19-2009, 08:58 PM   #14
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you can try a place called attitude performance off road. it varies, my shop is gonna be around 1200 per axle if i remember right parts and labor.

best advice is don't try to save money by getting your own parts, have the shop get the parts, that way they can't weasel out of any warranty claimes saying "your parts are defective"

or if you are up this way i can do them at a place called rock4x fabrication for a better price.
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Old 04-19-2009, 09:24 PM   #15
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For 33" tires and your 3-speed automatic transmission, I would regear to 4.10 gearing. It has no overdrive so if you went to 4.56, you'd be spinning pretty close 3300 rpms at 70 mph. I am running 4.88 and 35" tires with the same 32RH transmission and highway rpms are excessive, which produces about the same rpms as 4.56 and 33" tires would. I now cruise at 55-60 mph with only occasional jaunts to 65 mph when needed for traffic reasons. I'm only running 4.88 and 35" tires because I recently converted to the 32RH from a 5-speed manual.
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Old 04-19-2009, 09:55 PM   #16
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Friend posted this up and i stuck it in my photobucket. Hope some find this handy.
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Old 04-19-2009, 11:33 PM   #17
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damn. so am I looking at ~$2400 for both axles then? That sucks. Looks like all signs point to "Rubi."
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Old 04-20-2009, 09:46 AM   #18
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damn. so am I looking at ~$2400 for both axles then? That sucks. Looks like all signs point to "Rubi."
No, it's more like $1100-1200 for both axles including all parts and labor. I have regeared twice and the first time was about $1300 when I didn't negotiate well and just under $1100 the last time when I bargained harder.
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Old 09-23-2010, 09:46 PM   #19
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Gear Chart?

Is this chart accurate for both standard and automatic transmissions? If so then would 4.56 gears be good from a 31" tire to a 33"? Also, I've read other places that more than just the gears need to be replaced on the way up from 3.07, is that correct or is it still around a 1200$ job?

D30/D35, 3.07 gears, 4.0L, 5spd manual
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Old 09-24-2010, 09:47 AM   #20
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Is this chart accurate for both standard and automatic transmissions? If so then would 4.56 gears be good from a 31" tire to a 33"? Also, I've read other places that more than just the gears need to be replaced on the way up from 3.07, is that correct or is it still around a 1200$ job?

D30/D35, 3.07 gears, 4.0L, 5spd manual
Yes, the chart is good for either transmission. 4.56..... depends on how you drive your jeep. If you do a fair amount of highway driving I would go 4.11 or maybe 3.73. If not 4.56 or 4.88 for more off-road use.

The only thing you would need to replace(outside of a rebuild kit) is the carrier and it depends on what gear ratio you currently have and are changing to. Generally there are two different carrier sizes per axle and it depends on what gear ratio you use as to which carrier you would install. For your front axle one carrier is for gears 3.73 to 5.38 and the other carrier is for gears 3.07 to 3.54.

The job will on average be between $850 and $1200 per axle regardless. A new carrier is between $50 and $75.
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Old 09-24-2010, 10:28 AM   #21
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Be wary with such charts as they only show the rpms you will achieve when the transmission has been shifted into whatever gear provides a 1:1 drive ratio. That means you're not in your final cruising gear if your transmission has an overdrive.

So if you have the 5-speed manual, those rpms shown are for when you are 4th gear. If you have the 4-speed automatic, they would be for with the Overdrive disengaged. Or if you have the 6 speed, those rpms are what you would see in 5th gear.

So don't let the rpms shown scare you, they are only accurate for the 3-speed automatic in its final drive ratio.
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Old 09-24-2010, 11:39 AM   #22
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Wow. I set up the rear end in my Cutlass on my own (8.2 inch 10 bolt...with the money I have in axles, gears, and a new carrier I should have just bought a 12 bolt)...and what these guys said is absolutely correct....it is a stressful thing to do, as its all in the details getting the thing right. However with the prices these guys are throwing around, I'm glad I did it myself. A couple days in the garage is certainly worth a grand...though again, you've got to have the patience to NOT say, 'close enough' as it really needs to be spot on and have to be willing to get the correct tools for the job.
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Old 09-24-2010, 11:59 AM   #23
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I have the 32RH auto trans and I am running 33" tires too. Engine is the inline 4.0. My Jeep is my DD and am very happy with its performance both on and off the road .

My Jeep came straight out of the factory on 3.07 gears. When I upgraded to 33" tires, I regeared to 4.10s. In my opinion, I think 4.10 is spot on for the 32RH for the freeway and on the trails .

One thing you may want to consider is to take advantage of the work that will be done on your axles - so in addition to re-gearing, you may also would want to consider upgrading your D35 to a Superior35. During my regear, I also have my shop install a Detroit TrueTrac limited slip in both my front and rear axles. I also exchanged my OEM D35 shafts for alloy 27 splined shafts.

Great for a DD .
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Old 09-24-2010, 02:41 PM   #24
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i got a 97 4cyl ,and a 3 speed auto and cant decide on 4.56 and a super 35 or a d44 with 4.56 .have 3.73 now and 31s tires .it a dog on hills with 3.73 and doin 60mph is not easy , but just found out i have a manifold leak so mightbe part of problem
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Old 09-24-2010, 03:06 PM   #25
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i got a 97 4cyl ,and a 3 speed auto and cant decide on 4.56 and a super 35 or a d44 with 4.56 .have 3.73 now and 31s tires .it a dog on hills with 3.73 and doin 60mph is not easy , but just found out i have a manifold leak so mightbe part of problem
Will you be staying with 31" tires?

A manifold leak can cause the engine to run way rich which will impact power. The 02 sensor detects extra 02 in the exhaust gasses from the manifold leak so it erroneously tells the computer 'Scotty we're a-runnin' way too lean down here, richen it up!'.
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Old 09-24-2010, 03:28 PM   #26
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I think I would like to lean more towards the power side of the gearing ratio, long term plan is 35's, 4.88, and a D44 swap into the rear- but I'm a ways off from all that.

Have 31's right now but want to do the RE superflex 3.5" and 33's within the next year or so... That's why I'm trying to determine a tolerable ratio for 31's then up to 33's.

Jerry- if that RPM is for fifth gear then wouldn't 4.56 put me heavy on the power side with 31's and then pretty much ideal for 33's?
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Old 09-24-2010, 03:35 PM   #27
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Jerry- if that RPM is for fifth gear then wouldn't 4.56 put me heavy on the power side with 31's and then pretty much ideal for 33's?
Yes, exactly.
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Old 09-24-2010, 05:31 PM   #28
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will be going to 32 or 33s down the road

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