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Old 11-30-2012, 07:20 PM   #1
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Unhappy Potential differential problem ?

Thanks to this forum, I gained lot's of knowledge about my Jeep, to the point that I even started playing mechanic (which is - when you are official mechanical retard with two left hands - like myself - very dangerous)
Today I decided to change the engine oil and to change the rear differential fluid. Went to store and bought Mobile 1 (5W - 20) - 6 quarts, and Mobile 1 75W-90 differential fluid. Thanks to this forum, I already knew about the site where to order my Wix 57526 filters, so I had 3 filters delivered to my house few days ago (at dirt cheap price).
Engine oil change went smooth. The only problem is that I almost had a hard attack when I noticed that my oil drain plug was so lose I could unscrew it by my hand . Yet another reason not to take my Jeep to oil change place and trust some 18 year old punk with my Jeep. I know for sure from now on I am doing my engine oil changes.
With rear differential I had a little problem.
I have 2013 JKU Rubicon and I just turned 4,500 ml on it.
I decided to dump the original differential fluid and go with synthetic. Prior to this I educated myself here as much as I could, plus I did some research on Internet on the fluid capacities of my (Rubicon's) differential which is Dana 44. I found out that it takes about 2.25 quarts (by many) or about 2 quarts (by some).
When I came from work I jumped on that task while engine and everything was hot. I opened both plugs of the differential and let it drain for solid 1 hour. When the fluid stopped dripping I closed the bottom plug and started pouring fresh fluid in. I came close to 2 quarts when I already reached the point where fluid is leaking out (from the upper) hole.
I forgot to say that I noticed when I took of first the upper plug that fluid started coming out like crazy. It appeared to me like dealer filled it up to the max (probably over filled it).
Now I have to go to bed thinking I don't have enough fluid in my rear differential - because I didn't even reach 2 quarts let alone 2.25.
Should I drive it around tomorrow and re-check this situation ?

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Old 11-30-2012, 07:28 PM   #2
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You can recheck it tomorrow but diffs arent that picky. It's hard to over fill them. Since it just splashes the lubricant instead of pumps it like engine oil, as long as you are close that's fine. Make sure you check it and fill it on level ground. But sure, for extra assurance you could check it tomorrow and add some if needed

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Old 11-30-2012, 07:28 PM   #3
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I have serviced a bunch of these. You will be fine.

Remove the top plug tomorrow and top it off (if it needs any). That's why the top plug is where it is, so you cannot overfill it.
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Old 11-30-2012, 07:29 PM   #4
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If you filled the diff until fluid started flowing out the fill plug hole, you are good to go. Don't overfill or you risk having it blow out the vent hose.
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Old 11-30-2012, 07:31 PM   #5
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Also, before you put in 6 qts of oil, put in 5 (or a 5.1 jug) and run engine for a minute and let stand a couple minutes. I get 5 1/2 qts max at top of oil indicator range.
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Old 11-30-2012, 07:32 PM   #6
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If oil is coming out the fill plug hole you should be fine. If you feel you need to put more in you can jack up one end of the jeep to get more in.
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Old 11-30-2012, 07:33 PM   #7
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Right on it all
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Old 11-30-2012, 07:42 PM   #8
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Thanks guys !!!!
Now I can sleep.
Tomorrow I may check it again, but now I am confident that all is good with my baby.
Thanks again.

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