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Old 10-22-2010, 07:36 PM
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Rubicon Differential

Did a search and checked the manual, but not sure that I am comfortable with what I have read. I'm going to change the differential fluid tomorrow on my Rubi and am not sure what I should use. Manual says Mopar Hypoid Gear Lubricant (SAE 80W-90) (API GL5). Does it have to be Mopar? Do I need anything else because of the lockers? Thanks!

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Old 10-22-2010, 07:50 PM   #2
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No it doesn't need to be Mopar, just a good quality gear oil.

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Old 10-22-2010, 07:51 PM   #3
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and you don't need any addatives either.
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Old 10-22-2010, 08:01 PM
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Thanks guys....Thought so, but my wives Nissan can ONLY take Nissan coolant. I replaced a radiator to prove it. Anyway....Do you know the capacity of each diff? 2 quarts a piece? Can't seem to find that in the manual. Though I am on my second gin and tonic. Thanks!
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Old 10-22-2010, 08:03 PM   #5
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Buy 5 quarts and you should be able to both diffs
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Old 10-22-2010, 08:03 PM   #6
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Yes D44 takes 2 quarts.
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Old 10-22-2010, 08:05 PM   #7
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Quote:
Originally Posted by bruckerw View Post
Thanks guys....Thought so, but my wives Nissan can ONLY take Nissan coolant.
That is incorrect. They may have TOLD you that but there are plenty of compatible aftermarket coolants that are compatible with Nissans. There are plenty that are incompatible too though so you likely just put the wrong type of coolant in.

And X2 on the comment that you do not need to use Mopar differtial lubricant. Any GL-5 gear lube like 75W-90, 80W-120, 90W-140. etc. s fine and no additives are needed. If you tow, stick with a higher number viscosity. If you don't tow, the exact viscosity is not critical so long as the gear lube is labeled GL-5 and is a good quality like Valvoline, Mobil, Havoline, etc.
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Old 10-22-2010, 08:34 PM   #8
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With Riddler diff covers my Rubicon holds 64 oz. in the rear diff and 62 oz. in the front.
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Old 10-24-2010, 03:43 PM
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Thanks for the help folks. Did my diffs and transfer case today. Feeling alot better now. Bought the Jeep used and was not sure the last time that they were done. Fluid was really clean, but at least I now know where I stand.

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