Diff. Fluid Change Question

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Nov 3, 2009 | 07:47 PM

Hellbound13

Thread Starter

JK Jedi

Joined: Apr 2008

Posts: 4,470

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From: Westchester, NY

Diff. Fluid Change Question

I am about to change my diff. fluid and Im switching to synthetic. (Mobil 1)

My question is, will I have to stick with synthetic from here on out?

Nov 3, 2009 | 09:26 PM

B11

JK Newbie

Joined: Oct 2009

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From: Wa.

No but why would you want to change back?

Nov 4, 2009 | 05:59 AM

db09JKU

JK Super Freak

Joined: May 2008

Posts: 1,425

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From: Memphis

Quote:

Originally Posted by JK-Holiday

I am about to do this on my JK this weekend. Do I need to add the LSD additive to this as well or just the Mobil 1. I'm using 75/90 full synthetic. I know on the web site it says "compatible" with most LSD's. I'm sure the Trac-loc in the D44 rear is compatible. I don't want to ruin the clutches I guess. Can't afford a new locker system right now.

Great write up. http://project-jk.com/jeep-jk-write-...hange-write-up

Nov 4, 2009 | 06:40 AM

saltman

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Joined: Jul 2007

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Pretty sure the difs come with synthetic from the factory.

Nov 4, 2009 | 06:47 AM

Hellbound13

Thread Starter

JK Jedi

Joined: Apr 2008

Posts: 4,470

Likes: 1

From: Westchester, NY

Quote:

Originally Posted by B11

No but why would you want to change back?

Because in case my diff goes under warranty the dealer is going to put the regular stuff back in.

Nov 4, 2009 | 06:50 AM

racer83l

JK Junkie

Joined: Sep 2007

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From: Long Island, NY

the MOPAR fluid is synthetic... thats what I use... I would imagine thats what they fill it with initially

Nov 4, 2009 | 07:16 AM

Hellbound13

Thread Starter

JK Jedi

Joined: Apr 2008

Posts: 4,470

Likes: 1

From: Westchester, NY

If the Mopar is synthetic why does it require a LSD additive?

Also anyone know why its costs so much more than say the mobil 1?

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Nov 4, 2009 | 07:50 AM

ronjenx

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Joined: Feb 2008

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From: Maine

Quote:

Originally Posted by racer83l

the MOPAR fluid is synthetic... thats what I use... I would imagine thats what they fill it with initially

Two people in this thread have said the original stuff in the diffs is synthetic. Could be, but I would have to see the bottle to believe it.

The MOPAR stuff is synthetic only if it says "synthetic" on the bottle.
Initially, they come with Mopart Gear & Axle Lubricant (SAE 80W-90) (API GL-5), which is a general purpose GL-5 gear oil. I don't believe it says synthetic on those bottles.

Nov 4, 2009 | 07:52 AM

saltman

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Joined: Jul 2007

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This is what the manual says for 09.

Axle Differential (Front) MOPAR Gear & Axle Lubricant (SAE 80W-90) (API GL-5) or equivalent.
Axle Differential (Rear) 226 RBI (Model 44) - MOPAR Gear & Axle Lubricant (SAE 80W-90) (API
GL-5) or equivalent. For trailer towing, use MOPAR Synthetic Gear & Axle
Lubricant (SAE 75W-140) or equivalent. Models equipped with Trac-Lok™
require an additive.

I think the 07 was different. I think it said 44s had the synth in it and the towing statement wasn't there. I will have to check. Maybe I'm remembering my TJ/LJ info.

Last edited by saltman; Nov 4, 2009 at 07:54 AM.