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Old 05-01-2015, 01:36 PM
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rear axle ratio

OK, so I am trying to learn as much about this '93 Jeep as I can. In looking at it, I am a bit confused about the rear axle ratio. The "equipment list" even has the same ratio, and I think it is really weird. It says that my rear axle ratio is 3.07.

Is that weird? Is that the same as the gearing? I have seen people on here talk about 4.11 gears, 4.56 gears. Are my Jeep gears really 3.07? And if so why? And since this Jeep has 35's, this is probably not the ideal gearing for such large tires no?

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Old 05-01-2015, 01:39 PM   #2
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Yes 3.07 would be a normal gear, no jeep came stock with over 4.10 gears. You need to regear if you're running 35's, and really need a new rear axle if you're still running the D35.

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Old 05-01-2015, 02:26 PM
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Thanks! Everything is stock as far as I know except for the 4" lift, so I appreciate the input. So the rear axle should be stock as well. The previous owner didn't seem to know much about Jeeps, or cars for that matter. I get the impression he had the 4 inch lift put on, and the 35's because all the cool kids had a lift and big tires. "All show, and no go" mentality.

That being said, it is what is on the Jeep currently. So at least now I know. It is my baseline.

Since this will be my sons first ride, and he will be 99.9999% of the time, driving 2 miles to school and back, with no off roading at this time, how pressing is this issue? Obviously it is not ideal, and I get it. But I doubt he (nor I) will have the resources to:

A.get smaller rims and tires, or
B.re-gear, and potentially a new rear axle

anytime soon in the immediate future. So at this point, are we causing damage to anything driving on city streets teaching him to drive a stick shift with 35" tires on stock axles with 3.07 gears?

And now I have another question. Looking at the rear axle ratio sheet I found online, if I wanted to stay on the 35's, I would need 4.56 gears to get the Jeep back close to factory. How much would that cost, and would that work in the stock rear axle, or should I just look for a new rear axle as well? How much would that set me back?

As always, thanks much for the support, as I progress through being a noob in the Jeep world.
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Old 05-01-2015, 03:43 PM   #4
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As long as he is street driving the gearing and tire size may not be critical. The gearing may make it hard for him to keep it at highway speed on the freeway, he may never be able to use 5th gear and keep his speed up. Make sure he understands that dropping the clutch for a fast take off will possibly chew the gears up as they try to get those heavy tires rolling.
New gearing can run as high as 1000 per axle if you have someone else do it. Most find it easier and cheaper to find a jeep 4.10 axle in a junk yard and swap it in for the front D30. For the rear an 8.8 from ECGS is the way to go unless you have the ability to do your own swap from a junkyard Ford Explorer.
I wouldn't spend the money to change gears until you were ready to swap the rear axle.
Another option you may consider is a Craigslist swap. Your 35" tires for someone else's 33" tires. Those 35" tires are a pretty popular size as are 33's so I don't think it would be hard to find someone willing to trade, you just have to make sure you're getting tires with good tread.
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Old 05-01-2015, 03:50 PM   #5
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I bought a desert truck a while back w/8.8 in the rear. The guy told me it had 4.10 gears but the tag said 3.07 on the rear diff.
But, I did the wheel/driveline rotation count and formula I read online and it did indeed have 4.10.

I would double check that the tag is the true gear ratio
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Old 05-01-2015, 04:35 PM
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pardon my ignorance, Reno92, but what is ECGS? And how do I tell what kind of "Dana" axles I have in front and rear? I am assuming you mentioned the Front gears would need to be changes too, because I want the same gears in front and rear, so the wheel turn at the same speeds?
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Old 05-01-2015, 05:02 PM   #7
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Stock on most jeeps is D30 in front and D35 in rear, there are a few with D44 in the rear. It should have a tag on the differentials and you can tell by the shape of the cover if you want to post s photo. ECGS is East Coast Gear Supply, they build bolt on Ford 8.8 or D44 for the rear and the cost is cheaper most shops charge for a gear change. Yes the axles must match unless you remove the front DS (you could just not use 4x4 but I'd remove the Drive shaft.
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Old 05-02-2015, 04:41 AM   #8
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the best and prudent thing to do is to verify the gears in both axles... change the diff fluids, and when you do that, read the stampings on the ring gear...

the last four digits should be the gear ratio.

mine say 3911 (last four digits on a long list of numbers).

39 / 11 = 3.54 (or 3:54) as my ratio

check yours to be shure... turning the wheels and exles to check will not be accurate.. no way to tell the difference between 4.10 or 4.11 etc


good luck
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Old 05-02-2015, 06:33 AM   #9
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Quote:
Originally Posted by reno92 View Post
Yes 3.07 would be a normal gear, no jeep came stock with over 4.10 gears.
My 1995 with a 2.5 and an AX-5 came from the factory with 4.10 gears front and rear. It says it on the tag and it is stamped on the ring gear.

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