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Old 03-19-2011, 07:28 AM   #1
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Hey guys ok so we all know about that event coming up 26th-27th. And that also my rear ring and pinion is all screwed up. So my problem is that I want to get up to the 4.56 gear ratio in the front and rear but I have no clue what my from and rear gear ratios are. 87 yj 4.2L man. 6cyl inl.

Hopefully if you guys can help me out and i can buy my stuff at 4wheel parts i get install it all before friday and go on the trip. I really dont want to miss this trip and I can use any help you guys can give me please

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Old 03-19-2011, 11:06 AM   #2
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Hey guys ok so we all know about that event coming up 26th-27th. And that also my rear ring and pinion is all screwed up. So my problem is that I want to get up to the 4.56 gear ratio in the front and rear but I have no clue what my from and rear gear ratios are. 87 yj 4.2L man. 6cyl inl.

Hopefully if you guys can help me out and i can buy my stuff at 4wheel parts i get install it all before friday and go on the trip. I really dont want to miss this trip and I can use any help you guys can give me please
I have a 93 with the 4.0 and a manual and my stock gearing is 3.07. Not sure if it is different for the 4.2 though. Good luck, would be great to have you on the trip.

If your axles are stock and have not been apart before, there should be a metal tag on the side of the diff housing that has some numbers stamped into it. Those numbers tell your gearing.

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Old 03-19-2011, 11:42 AM   #3
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might have to pull covers and count teeth on ring and on pinion. or if you clean the ring up real good the ratiol should be ingraved or written on it also look on pinion face for numbers also.
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Old 03-19-2011, 11:44 AM   #4
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forgot to mention, look on spec tag might be coded on there.
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Old 03-20-2011, 03:07 AM   #5
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Don't worry about your existing ratios for purposes of carrier selection, have the installer take care of all that. If you plan to buy parts on your own to get a slightly larger discount on them to hand them to the installer to install, don't. Doing so opens you up to a can of worms if anything goes wrong during or after the installation. The installer will blame your parts and the parts distributor you bought them from will blame the installer and it's the installer who normally creates such problems. Then you are left to get the parts replaced on your own (you provided them) and then the installer will want more labor $$$ from you since, remember, he blamed the parts you provided him.

Have the installer provide and install everything. That way his warranty will cover both parts and labor with no question. If you push the installing shop, they will discount the parts in order to get you to use them to install them which is where most of their profit comes from.
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Old 03-20-2011, 06:03 AM   #6
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Sounds good jerry but I am on a tight budget, I go to school still and I don't really make enough money at my job so any money I can save would be great.
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Old 03-20-2011, 11:40 AM   #7
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you can handle it, its not rocket science!!! better to d i y and get the knowlege of what ya got! i know where your coming from on the tight budget!
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Old 03-20-2011, 01:03 PM   #8
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Just be prepared, swapping ring & pinion gears is not an easy task and if you don't do it perfectly, your new gears will be toast short order. In my two local 4x4 shops, out of 8-10 SAE Master Techs working there, they each only have 1-2 techs they trust to do ring & pinion installations.
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Old 03-20-2011, 01:18 PM   #9
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Just be prepared, swapping ring & pinion gears is not an easy task and if you don't do it perfectly, your new gears will be toast short order. In my two local 4x4 shops, out of 8-10 SAE Master Techs working there, they each only have 1-2 techs they trust to do ring & pinion installations.
trying to scare the guy?be sure to measure the shim pac thickness reinstall with that for a starting point.i havent done that many but the few i have are still on the road turning.ones got over 50,000 mi. on it used by a over the road salesman. what i'm saying you can do it.
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Old 03-20-2011, 01:32 PM   #10
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hey rebuilt,you can do the swap yourself as i discribed and then if you want take it to a shop to have it mated to be right on.they shouldnt charge as much because most the hard stuff is done. get a book if you need or look on here there might be a thread or somthing that goes into setting back lash and such. digital micrometers and base's arnt that pricey anymore.
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Old 03-20-2011, 03:54 PM   #11
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trying to scare the guy?
Not at all, simply being realistic by not painting a technically challenging job into something easy for a novice. Installing new gears is not simply or primarily just setting the backlash, which is fairly simple job if being done by itself like when installing a full case locker.

What is difficult is setting the combination of the pinion depth which requires several iterations using a bearing test set, together with the backlash. Those two steps interact with each other so there's some back and forth between the two steps. Not to mention correctly setting the pinion bearing and carrier bearing preloads. The more one knows about installing new ring & pinion gear sets, the more understanding of the true technical challenge being faced is understood.

Here's Randy's guide to installing a new ring & pinion gear set. I'd say Rebuilt needs to read through it to see if he agrees it's as easily done as you claim it is. Especially since he doesn't have much time before this coming weekend.

http://www.ringpinion.com/Content/Ho...structions.pdf
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Old 03-20-2011, 04:45 PM   #12
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long story short it can be done.and i also think he should read it and if he's some what mechanical he can do the job, he dont need a degree to accomplish this. i dont think he's building a nascar or top fuelie.i will bet good money that say'sif he measures his shim packs install the same back in and it will be close to pass for a long service time.
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Old 03-20-2011, 04:46 PM   #13
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hey rebuilt where are you in all this?
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Old 03-20-2011, 05:12 PM   #14
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I am in whittier, Honetly I have no idea what to do anymore haha i dont know whether to do it myself or have someone do it for me
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Old 03-20-2011, 05:21 PM   #15
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well i hope jerry didnt scare ya! if money gets tight keep in mind you can do most all the work yourself and feel confadent on it being right. good luck! just out of curiousity has jerry ever done this kinda rear end work before?
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Old 03-21-2011, 02:22 PM   #16
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I counted my ring and pinion my pinion is 11 and ring is 39 so i got a 3.55 gear ratio hahaha
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Old 03-21-2011, 02:39 PM   #17
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So would it be a good idea to get 4.56 in the rear and leave my current gear ratio in the front the same and just go on the trip in 2wd? the rear has a locker
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Old 03-21-2011, 03:04 PM   #18
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So would it be a good idea to get 4.56 in the rear and leave my current gear ratio in the front the same and just go on the trip in 2wd? the rear has a locker
that doesnt sound like a good idea...
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Old 03-21-2011, 05:25 PM   #19
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that doesnt sound like a good idea...
I agree. Even tho it doesn't sound too bad on the trails of the meet and greet, I wouldn't want to trust my jeep in just 2wd if I didn't know what exactly to expect
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Old 03-21-2011, 05:31 PM   #20
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guess im missing out, well i tried everything possible to try and make this trip and from here on theres not enough time so i guess ill have to wait until the next one
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Old 03-21-2011, 07:34 PM   #21
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thats a bummer dude. you could always drive down and just hop in someone elses jeep for the trail and hang out party and camp.
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Old 03-21-2011, 07:51 PM   #22
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Yea I can do that but its not the same if I dont get to do the course
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Old 03-21-2011, 10:33 PM   #23
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So you have 3.55, what size tires are you running? Do you have any other issues besides you want 4.56 and can't get them installed in time?
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Old 03-25-2011, 06:33 AM   #24
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Nope am unable to get them installed, yea I am pissed. I was really excited to meet everyone in the forum. I have 33" tires. And yea I have 3.55.
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Old 03-25-2011, 09:39 AM   #25
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Hey, if you have another mode of transportation, come on out and I am sure someone will find a spot for ya to ride along. I know it is not the same a driving the trails, but still fun.

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Old 03-25-2011, 10:20 AM   #26
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Yep I have room and you'd be welcome to drive my rig part of the way.

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