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Old 11-08-2008, 10:39 PM   #1
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Axle I.D. And Gear Ratio

What's the easiest way to tell which axles I've got on my TJ and what my gear ratio is?

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Old 11-08-2008, 10:52 PM   #2
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If it is not a rubicon you have a D30 front. Your rear axle could be a D35 or D44.
Easy way to tell on the rear axle is check the fill plug... if it has a rubber/plastic plug on the diff cover it is a D35, if the diff cover has a metal fill plug it is a D44.

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Old 11-08-2008, 10:56 PM   #3
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To find your gear ratio, look on the rear diff cover. On the left side of the cover there should be a metal tag held on by one or two of the cover bolts. The gear ratio will be stamped on the tag. 3.07, 3.73, and so on.

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This is all IF the axles are the factory axles. But from the pic's of your new TJ. I'm betting there stock.
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Old 11-09-2008, 03:37 PM   #4
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Careful on IDing all none rubicon's as d30's. If anyone purchases a tj today they are used tj's and previous owner could have swapped it out for a D44 or something else. Dealership for instance rarely know or care what is under the vehicle. My wife bought a beetle a few years back she asked if it was a turbo they said NO she got home popped the hood and YES it was a turbo.
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Old 11-09-2008, 04:03 PM   #5
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chiro, thats a nice steal thats why you look at something before you buy it.. The difference between a turbo vs non turbo is very easy to see, feel, or even hear.
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