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Old 03-16-2014, 04:20 PM   #1
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95yj axle build

I have a 95 rio with a 4" suspension 1" body 35" tires. I want to lower my gear ratio. I have 4:10 n I was thinking of going to 4:88. Any advice would be great. Thank you

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Old 03-17-2014, 03:56 AM   #2
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It's pretty much straight forward. Just do it, or have it done.

The axles already have 4.10's in them, so they already have the larger carrier. The carrier break is 3.53/3.73. So you can install the deeper gears without having to change anything but the ring and pinion.

When I did mine, I purchased master rebuild kits for them, and that comes with new bearings and seals.

But the person that is going to do the gears for you should know that everything (bearings and seals)needs replaced as long as you have it apart. A gear change shouldn't be completed or even attempted by someone that isn't qualified to do so. Main reason is...IF they are off by as little as .005 of an inch, when setting the gears up, it will destroy the gears and possibly damage the housing.

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Old 03-17-2014, 06:22 AM   #3
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I live on long
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Old 03-17-2014, 06:24 AM   #4
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I live on long island and there's only 2 places that specializes in moding jeeps. If I did go with 4:88 would I lose top speed. I only have a 4 banger
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Old 03-17-2014, 11:03 AM   #5
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Not with 35" tires. It will actually help some. 4.88 is the normal gear ratio for a set of 33's. The correct gear ratio for a 4cyl and 35's is a 5.13, but they wont fit in the housings, 4.88 is the deepest you can go.
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Old 03-17-2014, 11:23 AM   #6
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Thanks for the info. Now I would have to do the front with the same gears as well right
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Old 03-17-2014, 07:40 PM   #7
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If I did it myself would I need a case spreader
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Old 03-17-2014, 07:51 PM   #8
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Do I have to do the front too??? If I do it myself. Serious???
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Old 03-17-2014, 08:01 PM   #9
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I like doing my own work and its my first jeep
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Old 03-17-2014, 08:13 PM   #10
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Both axles have to have the same gear ratio
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Old 03-17-2014, 08:27 PM   #11
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Ok. What about a case spreader
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Old 03-17-2014, 08:37 PM   #12
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Without trying to sound more like an idiot I have dana 30 front axle and dana 35 out back. Correct and both same gears and a master rebuild kit
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Old 03-18-2014, 03:11 PM   #13
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A case spreader isn't used on the Dana 30 or the 35. It's made for the front loader rear ends like a Ford 9 inch.

Yes you need matching gears for the front and the rear. And a master rebuild kit for each.

And another tidbit of info that you need is...you have a HP Dana30. HP is high pinion, and that means that you need reverse cut gears for in it.

Doing the gears takes A LOT of knowledge. The normal "ace" mechanic doesn't have a clue as to what it takes to do gears in a housing properly.

I have been turning wrenches for close to 40 years now, and just finally learned how to set up gears a few years ago. Didn't realize that it was going to cost me a couple grand in tools to get set up to do it, or I would've left it up to the pros.
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Old 03-18-2014, 03:26 PM   #14
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I think im just going to have someone else do it for me. I went to barren institute of automotive but my drive line class was 4 days. I learned shit from it. I don't want to blow up my own diffs. Ill let a pro do it
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Old 03-18-2014, 03:36 PM   #15
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Quote:
Originally Posted by 0III0forlife View Post
A case spreader isn't used on the Dana 30 or the 35. It's made for the front loader rear ends like a Ford 9 inch. Yes you need matching gears for the front and the rear. And a master rebuild kit for each. And another tidbit of info that you need is...you have a HP Dana30. HP is high pinion, and that means that you need reverse cut gears for in it. Doing the gears takes A LOT of knowledge. The normal "ace" mechanic doesn't have a clue as to what it takes to do gears in a housing properly. I have been turning wrenches for close to 40 years now, and just finally learned how to set up gears a few years ago. Didn't realize that it was going to cost me a couple grand in tools to get set up to do it, or I would've left it up to the pros.
This is really really good advice. I looked at the master rebuild kits while doing my build as I had stock 3.07 gearing. My mentality was "how hard can it really be?". I am so glad I didn't take that job on. I spent time reading about doing it and quickly realized it was beyond my skill level. For now I'll leave it to the pros.
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Old 03-18-2014, 03:44 PM   #16
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Yea im letting a pro do it

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