best synthetic differential oil ??? - JeepForum.com

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post #1 of 138 Old 12-13-2008, 03:55 PM Thread Starter
drumkite2
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best synthetic differential oil ???

I'm getting ready to change the front and rear diff oil to synthetic, and was wondering which is the best for an 06 Rubicon? Also have an 02 sport with Dan 44 rear 3.73s. Would this need the same as the Rubicon? Do these diffs use gaskets, o-rings, or RTV?

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post #2 of 138 Old 12-13-2008, 05:15 PM
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Amsoil Severe Gear. They make 3 weights. For your application, 75-90 for normal service in both rears. If you tow, 75-140 in you back axle.

You can use RTV, or gaskets. I personally like the Lubelocker gaskets, just make sure you follow their instructions for torque of the bolts that hold the cover on, use a little Blue (medium strength) Locktite on each bolt. That will prevent the bolts from loosening and the cover from leaking.

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post #3 of 138 Old 12-13-2008, 06:02 PM
'B'wigstrailrig
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I have redline 75-140 in my rear. You dont use your front diff as often so you might just want to leave regular gear oil in there. If you drive through water then you should just stay with gearoil front and back. Costs to much money to change out everytime you submerse your axles.
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post #4 of 138 Old 12-13-2008, 06:06 PM
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post #5 of 138 Old 12-13-2008, 07:01 PM
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post #6 of 138 Old 12-13-2008, 08:16 PM
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Use any 75w-90 gear lube with a GL5 rating, even if you get it from wal-mart. Synthetic is overrated.
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post #7 of 138 Old 12-13-2008, 08:49 PM
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the book calls for synthetic in the Rubi axles, anyone know why? am I wrong to assume it may have something to do with the axle locking mechanisms, perhaps it helps them lock/unlock quicker. anyone run reg gear lube in them, if so how did they (lockers)do?
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post #8 of 138 Old 12-13-2008, 09:38 PM
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amsoil fo sho!

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post #9 of 138 Old 12-14-2008, 07:02 AM
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I was told by a very reliable source that Currie will void all warranty if they find synthetic gear oil was used in their axle assemblies.

www.bobistheoilguy.com/gearoiltest.htm link above confirms that convertional gear lube performes better then synthetic gear lube.
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post #10 of 138 Old 12-14-2008, 07:26 AM
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Amsoil seems to work just fine. But since I go through water crossings, I usually just stick with the regular stuff since I change the gear oil often.
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post #11 of 138 Old 12-14-2008, 08:38 AM
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The Rubicon calls for synthetic because the rear locker is also a limited slip diff. It needs the friction
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post #12 of 138 Old 12-14-2008, 08:47 AM
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Valvoline synthetic has the fricion additive ingredient.

http://www.valvoline.com/pages/produ...asp?product=58

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post #13 of 138 Old 12-14-2008, 08:53 AM
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rubi lockers are gear driven and do not need any modifiers, its only the clutch pack style ls that needs the friction modifier.
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post #14 of 138 Old 12-14-2008, 09:00 AM
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Quote:
Originally Posted by roadkill View Post
rubi lockers are gear driven and do not need any modifiers, its only the clutch pack style ls that needs the friction modifier.
X2. The lsd in the rear TJ Rubicon is a helical gear type. No clutch packs so no friction modifier is required
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post #15 of 138 Old 12-14-2008, 09:05 AM
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Go with what is in your manual so the dealer can't claim you put the wrong stuff in and void your warranty. Just my .02.

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