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Old 02-06-2011, 08:54 AM   #1
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Gear question

Ok, so let me start this one off by saying that I am not very knowledgeable about gear ratios and the like so hopefully some of the "gear head" jeepers out there can school me on this one.

I just picked up a 91 YJ with a 4" lift and 35" MTs on it. The jeep basically has no power in 5th gear and struggles up hills on the highway in 4th.

From what I've gathered I need to have the ring and pinion swapped out and 4-10s seem to be the best for a daily driver. I would like the best middle of the road for power and economy on the highway and yet still have enough low end to get through amateur off road stuff (mud snow etc.) I don't plan on rock climbing or anything like that.

My questions are this;
1. Are 4-10s the way to go?
2. Can someone give me the layman's version of what needs to happen to my jeep to accomplish this?
3. How much can I expect to pay to have this done by a professional?
4. How hard of a job us this? Could myself and a wrench turning buddy accomplish this on a Saturday or is this varsity level mechanics???

Thanks guys!

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Old 02-06-2011, 10:53 AM   #2
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What motor is in the jeep? All 4cylinder jeeps came with the 4.10 ratio stock. If you have a 6cylinder you could have 3.07 or 3.55. I personally would go with 4.56 gears. Check out this chart. It will probably run you about 1000-1300 to order the gears sets and have them installed. This is not a DIY project for the first timer. If you know someone with the know how ask them if you could watch. Setting up a gear set is tedious work and some special tools are required.


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Old 02-06-2011, 11:27 AM   #3
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x2, let the shop that installs the gears buy the parts, so if there's any problem they don't come back to you about inferior parts you purchased....
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Old 02-06-2011, 12:06 PM   #4
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I have the I6 so based on what I've seen online I think they are the 3.55 stock.
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Old 02-06-2011, 01:39 PM   #5
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You usually can find a set of 4.10 YJ axles on craigslist for cheaper than reagearing two axles.Plus you could keep or sell your parts
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Old 02-06-2011, 01:41 PM   #6
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You usually can find a set of 4.10 YJ axles on craigslist for cheaper than reagearing two axles.Plus you could keep or sell your parts
This is a good idea also. This you and a friend could do. As long as the new axles are complete it is an easy remove and replace job.

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