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Unread 04-13-2013, 05:55 AM   #1
Ansary
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Question in upgrading gears ratio

Hi Jeepers,

I have a YJ 95 6 cy 4.0L. I am in process of upgrading the gears ratio to 4.1 I ordered ring and pinion for both the front and rear deferential. The front ring and pinion are 41/10 and the rear is 37/9 the gear ratio will be 4.1 and 4.11111. Is the 0.11111 difference normal or it can cause a problem?

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Unread 04-13-2013, 06:11 AM   #2
1998zj
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It will be fine, all of the Jeeps out there running that ratio are like that.
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Unread 04-13-2013, 06:24 AM   #3
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Most 4wd vehicles are like that cause the size of the ring gear is a little different between the axles. Yoir good to go

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Unread 04-13-2013, 08:44 AM   #4
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You're likely to have more than 0.11111" of difference between the front and rear tires just from wear.
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Unread 04-13-2013, 09:12 AM   #5
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You will have to change the carrier as well sir.
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Unread 04-13-2013, 12:50 PM   #6
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I can't understand why should I change the carrier?
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Unread 04-13-2013, 12:53 PM   #7
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The difference between the front and rear ratios is normal, and it is nothing to worry about. If your old gears were less than 3.73 ratio then you will also need new carriers to match the new gears - they are a different size. Most Dana brand axles are designed this way, the change in carrier size occurs at 3.73 ratio.
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Unread 04-13-2013, 12:57 PM   #8
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The ring gears only fit a certain number of ratios and they change slightly in size. You'll notice a 4.88 pinion is tint just achieve that gear ratio. Because that's what it is. The ratio between the ring and pinion gears which transfers to torque to the wheels from the transmission which also has its settings called gears.

By the by, unless you're installing full carrier lockers, find a set of used axles and skip the expensive regearing process. Trust me. I've been there and done it. And sticking to the Dana 35 in the rear?
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Unread 04-13-2013, 12:59 PM   #9
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Quote:
Originally Posted by pete1991YJ View Post
The difference between the front and rear ratios is normal, and it is nothing to worry about. If your old gears were less than 3.73 ratio then you will also need new carriers to match the new gears - they are a different size. Most Dana brand axles are designed this way, the change in carrier size occurs at 3.73 ratio.
Pete is right. The break between the Dana 30 and 35 is at different places though. You can go up to 3.54 on the 30 and up to 3.73 on the 35 before you need to swap carriers.
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Unread 04-13-2013, 01:15 PM   #10
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Pete is right. The break between the Dana 30 and 35 is at different places though. You can go up to 3.54 on the 30 and up to 3.73 on the 35 before you need to swap carriers.
OOps my mistake, I thought thy were in the same place. There *is* a carrier size break though.
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Unread 04-13-2013, 01:25 PM   #11
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Per his thread on wrangler forum he is running 3.07 gears thus the need for new carriers front and rear. I told him that over there as well.
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Unread 04-13-2013, 01:28 PM   #12
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Per his thread on wrangler forum he is running 3.07 gears thus the need for new carriers front and rear. I told him that over there as well.
A very sincere kudos for following up.
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Unread 04-13-2013, 01:44 PM   #13
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A very sincere kudos for following up.
Lord knows I have made enough mistakes with my own jeep, hate to see anyone else doing the same. And thank you sir.
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