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Old 02-27-2014, 03:19 PM   #1
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gear/axle question

So I finally made it under my jeep today to check a few things out so I can start my mod planning. I checked the tags on the diff covers and come to find that they have different tags. The front says 3.72 and the rear says 4.11, neither of which came stock on a jeep I believe. 4x4 works perfect, I use it just about every day so I don't believe they are really different gears. So is there a way to know what gears I have without pulling the covers and counting? And how do I tell what axels I have and if someone has switched out the whole thing?

Here is the front tag


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And here is the rear


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Old 02-27-2014, 04:09 PM   #2
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you have a 4.10 front and a 4.11 rear which came stock with a 4 cylinder..you are good to go

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Old 02-27-2014, 04:18 PM   #3
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Ok I see the 4.10 on the front one now. The mechanic who looked at it told me it was 3.72 looking at the last numbers on the top row. Awesome, thanks
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Old 02-27-2014, 04:45 PM   #4
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that might tell you something about your mechanic.......just saying
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Old 02-27-2014, 04:59 PM   #5
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Quote:
Originally Posted by harleydragon View Post
that might tell you something about your mechanic.......just saying
^^^words of wisdom
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4.0 power tech>32RH>231j>4:10>35" MT's
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Old 02-27-2014, 05:04 PM   #6
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And that's exactly why I spend hours reading this site every day so I can learn and do everything myself. He works wonders on my girlfriends volkswagon though.

So why is one 4.10 and one 4.11? Why aren't they exactly the same?
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Old 02-27-2014, 05:10 PM   #7
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it is just the difference in the number of teeth on the ring gear versus pinion gear..the dana 30 and the 35 use different tooth gears...4.10 and 4.11 is so very close that without counting the teeth and doing the math,you would never know the difference
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Old 02-27-2014, 05:35 PM   #8
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it might have something to do with difference in ring gear size, d30(7.12) vs d35(7.62), so maybe the ratios cant match up exactly? but really thats just a guess.
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Old 02-27-2014, 05:39 PM   #9
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it might have something to do with difference in ring gear size, d30(7.12) vs d35(7.62), so maybe the ratios cant match up exactly? but really thats just a guess.
the size of the ring gear as well as where the pinion enters the housing makes different numbered teeth ride each other better..the manufacturer knows which gives the best mesh

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