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Old 01-15-2011, 02:55 PM   #1
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Differential Questions + Pics

Hey all, I have a few questions concerning my 06 Rubicon's differentials. I just pulled off the front diff cover so I can start to replace the outer axle shaft seal(its leaking) and I noticed that the gear oil didn't look quite right. It is a greyish color. Is that normal? Here are some pics of the oil and front diff.
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While I was moving the tires to watch it spin inside, I decided to see what gears I have in there.(I bought it from a dealership who didn't know) and I am supposing that I have the 4.10's. I spin the tire around once, but the front driveshaft only spins around twice. Is that right for 4.10's? I thought it was supposed to go around jut over 4 times. Please correct me if I am wrong. One last thing, I engaged the front locker and rotated the tires. The locker locks but when I turn one of the tires, it spins for a short time then the other one clunks in. Is it normal for there to be a lag there? And is it supposed to clunk at all? I apologize for all of the questions. I am also thinking of re-gearing since I have the front torn open. Any preference on the brand of gears I should look into? Im leaning towards 4.88's. Thanks for all of the help.

EDIT: I am running 33's

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Old 01-15-2011, 02:58 PM   #2
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Mine was the same color as your when i did mine, I wouldnt worry about it especially since its an 06. Also had to replace the pinion seal as well. There should be a metal tag on the diff cover that should indicate what the gear ratio is. If you post a pic of that we could tell you what gears are in it.

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Old 01-15-2011, 02:59 PM   #3
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My oil looked similar and smelled pretty bad.
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Old 01-15-2011, 03:00 PM   #4
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The tag indicates 4.10's
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Old 01-15-2011, 03:01 PM   #5
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Quote:
Originally Posted by Darkangel1713 View Post
The tag indicates 4.10's
Then thats whats in it then, unless someone before you re-geared it
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Old 01-15-2011, 03:03 PM   #6
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Thats the thing. Im not sure if they did or not. The dealership had no idea what was in it or on it.
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Old 01-15-2011, 03:03 PM   #7
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hahah, so that's what the tag was that I threw away. It was rusted out and couldn't really be read anyway.
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Old 01-15-2011, 03:05 PM   #8
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Old 01-15-2011, 03:10 PM   #9
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4:10's and 33's should be ok, 4.88's and 33's is going to raise the RPM's substantially. I hope your not doing it to try save any gas cause thats not going to happen.http://www.4lo.com/calc/geartable.htm
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Old 01-15-2011, 03:22 PM   #10
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Thanks Mike_3303 for that link. Turns out I do have the 4.10's. I want to change gear ratios cause it just feels sluggish when stomping on the gas. I heard that changing to 4.56's or 4.88's would help that problem.

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