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Old 10-03-2012, 03:46 PM   #1
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Used gears?

I have a 2012 jk sport with 3.21s (I know, rookie mistake). I am eventually moving up to 33s and would like to regear as well.

We can debate optimal gears and "why not just buy 4.88 or 5.12s" but for the the future I am almost sure I will stick only with 33s and just want more zippiness in the city. I also do highway driving so don't want to go too aggressive. Absolutely no rock climbing, only trails some dirt and mud and maybe snow. I think 3.73 would have been nice and 4.10 would be good too.

My question is that I have been seeing low mileage 3.73 take off gears for sale from folks and wondering if that is a decent option? They are low miles and much lower cost.

Thoughts on take off gears??

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Old 10-03-2012, 04:01 PM   #2
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You dont need to regear with 33s. People have advised to regear when u go 35+. Do u plan on wheeling a ton?

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Old 10-03-2012, 04:10 PM   #3
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No, not a ton. I was more hoping a regear could help with my stop and go city driving, peppiness off the line , etc.

I will probably go tires first and see how it goes...
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Old 10-03-2012, 04:22 PM   #4
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Used gears are not recomended. Some shops won't install them, the others charge more to do so then a new set. Those that also install used gears won't warranty the parts if there is a mistake.

Instaling axle gears is a precision job and needs to be done right the first time
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Old 10-03-2012, 04:22 PM   #5
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I live in chicago with 33s and its is still good off the line. Aev procal coming tmrw or fri for the odo fix. Itll be a lil sluggish bit hopong the procal handles shift points also. Regearing isnt worth it for what u r driving it for. Ride it and u can decide
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Old 10-03-2012, 04:45 PM   #6
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Like others said, drive it first. I don't think you'll notice much of a difference with the 33's.

Going one gearset lower isn't worth the cost, IMO.

If you do decide to do it, buy new gears for the reasons XJKnight mentioned. No telling what the PO did to em, if even only for a short time.
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Old 10-03-2012, 05:30 PM   #7
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10-4. I was a little reluctant in the first place, thats why I posted to get everyone's advice. Much appreciated!!

That saves money for the other stuff I want and will save up until I can afford the gears I want + a LSD or locker!!
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Old 10-03-2012, 05:44 PM   #8
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I see you have made up your mind but I will make a few points for anyone else considering the same thing.

You would have to change your carrier anyways since you have 3:21's so it would cost you more then you think.

The reason people charge more to install used gears is that it has to be perfect to match the wear pattern that the gears have established.

Also new gear sets are not that expensive, you would still have to pay for the install kit and labor. So why save a 100/150 bucks and not have any warranty?
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Old 10-04-2012, 07:52 AM   #9
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Quote:
Originally Posted by WatchThis! View Post
I see you have made up your mind but I will make a few points for anyone else considering the same thing.

You would have to change your carrier anyways since you have 3:21's so it would cost you more then you think.

The reason people charge more to install used gears is that it has to be perfect to match the wear pattern that the gears have established.

Also new gear sets are not that expensive, you would still have to pay for the install kit and labor. So why save a 100/150 bucks and not have any warranty?
This. Why buy used to save $100 on a $1500-2000 job?

FWIW, I have installed a few sets of used gears. All but one of them I removed myself. Each time I marked the gear pattern and measured the backlash before removal so I would know how they had been run before because "in spec" isn't close enough for used gears, they have to be EXACTLY as they were run before or they will be noisy and will likely fail. Plan on used gear to take twice as long to install as new (probably $400 more per axle in labor) and still expect them to make noise. And if the seller of the used gears doesn't have the pattern and backlash documented you have basically zero chance of them every being right.

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