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Old 03-30-2009, 10:19 AM   #1
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Axle Ratios

New to the forum, just joined today. I have a 2000 TJ that I picked up used. It's got 101000 miles but lots of fun left in her.

I am wondering what axle ratio comes stock in my jeep. Looks like a Dana 30 up front and a 35c in the rear. I just put some 30x9.5x15's on her and dont know which speedometer gear to put in?

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Old 03-30-2009, 10:40 AM   #2
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You have either 3.07 or 3.73 ratios with that combo.

There should be a tag on the rear diff cover at the 10 o'clock position that will have either of those numbers above stamped into it. You may have to clean the tag to read it.

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Old 04-04-2009, 09:21 PM   #3
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Will check it out. One other question, when I pull out the old speedo gear does tranny fluid leak out? Can always refill when complete but wanna be ready with pan and rags.

Thanks for the info
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Old 04-04-2009, 10:40 PM   #4
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When i looked up my jeep specs from factory this is what it said=Dana 30/186MM Front Axle 3.07 Axle Ratio 175MM Rear Axle, So does this mean 3.07 rear also or is it 3.73 due to the larger 175MM Axle?
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Old 04-04-2009, 11:38 PM   #5
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daanbc,

You will have the same ratio in the rear as you have in the front. If you have a 3.07 in the front then you have a 3.07 in the rear.
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Old 04-05-2009, 12:05 AM   #6
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Thanks
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Old 04-05-2009, 08:21 AM   #7
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Your honestly not going to be that far off with a 30" tall tire.

Maybe 4mph off...

I don't think it's worth it unless your going to run something above a 31" tall tire.

What's everyone else think?
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Old 04-05-2009, 08:39 AM   #8
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Being a little off doesn't really matter IMO. If you want to be exact go ahead and swap it out. I'm rumming 35's and i gut keep in mind my speedo is about 10 mph down
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Old 04-05-2009, 10:29 AM   #9
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Quote:
Originally Posted by 01 TJ View Post
daanbc,

You will have the same ratio in the rear as you have in the front. If you have a 3.07 in the front then you have a 3.07 in the rear.
For what you mean, that is true... they are the same ratios. But so no one gets confused, our axle ratios are normally off by .01 between the front and rear... like 3.73 and 3.74, 3.55 and 3.54, etc. That's because the Dana 30 and Dana35c/Dana 44 have different ring gear diameters which makes getting the ratio exactly the same cost-prohibitive. Only the Rubicon with matching front and rear Dana 44 axles always have exactly the same ratio. That .01 difference most TJ axles have is a non-issue in any onroad or offroad situation.
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Old 04-05-2009, 09:31 PM   #10
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4-5 looks about right. paced next to another car and fell right in there.
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Old 04-05-2009, 09:36 PM   #11
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No fluid should leak out when you go to change it. But as stated if you have not gotten the gear yet save a few bucks as the stock one will not be that far off with the 30's.
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Old 04-07-2009, 09:45 PM   #12
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4-5 is no big deal, most speedos are wrong from the factory anyway.

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