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Old 05-12-2013, 10:44 AM
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Thumbs up DIY- 2011 Differential Service/ Fluid Change

Hello, Jeep family! I finally got around to changing the oil in my differentials yesterday. Since I had done some searching (here and elsewhere) and found minimal information on the procedure for the WK2 I decided to do a step by step DIY. Hopefully this helps another gear head out! This DIY is for a 230mm rear w/ ELSD. Yours may vary.
First things first! Make sure you have the materials you will need. For my particular model this included 3 quarts of liquid gold (75-85 synthetic gear lube) 1 bottle of friction modifier (my local dealer does not stock the lube with mod already in it) a catch pan, rags or shop towels, 8mm allen bit and a fluid pump. I preferred to use the socket kind of allen wrench so an extension was needed to clear the exhaust pipe in the rear. Disposable rubber gloves and cleaner/ degreaser are recommended.


I took a 15 minute drive around the block to warm up the oil and stir up any dirt in the diffs. If you do this be careful of hot items under your rig- exhaust pipes, catalytic converter, etc. They can stay hot for a while.
I raised the QL to the ORII level which was high enough, but in order to take some pix I needed a little more room. I made these block ramps for servicing my wifes VW and just used them here. Dont forget to chock the wheels and set the E brake


Ok, so now down to work! I did the rear first because the cat was still pretty warm. In the next photo, you will see the socket in the fill plug. Loosen or remove this one FIRST! If you drain the diff first and can't open up the fill then you are in a world of hurt because then you can't put oil back in. The plug is on the passenger side of the differential about half way up the side. The camera is pointing towards the rear of the vehicle. (Note- all plugs are 8mm allen, and standard thread- CCW to remove/ CW tighten)


Then move on to the drain plug. This one is on the rear of the diff, lower passenger side.



The oil was fairly dark. Not worrysome, because it is a limited slip. Those with ELSD will note that the rear oil will be darker than the front and this is normal. With the plug removed, you can see a little oil on the threads. Note the dark color.


After drained, reinstall the bottom plug and torque. I went to 20 lb-ft. Now, I read on WK2Jeeps.com it is supposed to be 44 lb-ft?!? I will be calling my dealer on Monday to confirm this, but it sounded excessive for an aluminum plug. I will update this post as necessary.
To fill, insert the pump into the bottle and the hose into the fill plug hole. You may note that a cut the top of the oil bottle off because my pump was too big for the hole. I feared knocking it over while pumping. Luckily, no such debacle!




I pumped about half a quart in and then dumped the modifier into the oil bottle. If you have the ELSD, don't forget to add it. Don't wait till the end either, as there might not be room to get it all in.
I continued pumping until oil juuust started seeping back out the hole. This is where the rags and degreaser come in. Oh, and the gloves


As long as you don't significantly overfill it and it is just barely weeping out, go ahead and reinstall the fill plug. Again, I torqued to 20lb-ft for now. Once you clean up any oil residue, you can move to the front. We're half way done already!

This view is from the passenger side of the vehicle. Both plugs are on the side.


Fill plug out first!


Then the drain!


The color is pretty golden still. Definitely darker than fresh, but not black

After it finished draining install the drain plug and fill just like the rear was done. That wasn't so hard, now was it? Even taking photos it took me a whopping 45 minutes to complete and saved about $100 over the dealer!
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Old 05-12-2013, 10:50 AM
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Re: DIY- 2011 Differential Service/ Fluid Change

Awesome!!

What about the transfer case?
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Old 05-12-2013, 11:10 AM
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Re: DIY- 2011 Differential Service/ Fluid Change

Thanks!
X-case will be up next. I need to call the dealer first and see if it was done before I got it. Probably not since the odometer was just past the mark On the bright side, they did do the spark plugs
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Old 05-15-2013, 10:06 PM
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Re: DIY- 2011 Differential Service/ Fluid Change

It has been discussed on here that the "Friction Modifier" is now mixed with the oil from the supplier. Where did you read/hear that you had to mix it?
Front and rear diff fluid change
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Old 05-16-2013, 11:48 AM
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Re: DIY- 2011 Differential Service/ Fluid Change

Update: Per dealer, they torque to 15-20lb-ft on the plugs.
Quote:
Originally Posted by IRISH View Post
It has been discussed on here that the "Friction Modifier" is now mixed with the oil from the supplier. Where did you read/hear that you had to mix it?
Front and rear diff fluid change
It is only mixed if you purchase that part #. If you purchase the other part #, it is not. The difference being weather you buy an extra quart of oil for $50 or the modifier for $6. Per my local dealer, they don't even stock the oil w/ mod because it is less expensive to add the mod separately.
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Old 05-16-2013, 10:58 PM
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Re: DIY- 2011 Differential Service/ Fluid Change

Quote:
Originally Posted by The Evil Twin View Post
Update: Per dealer, they torque to 15-20lb-ft on the plugs.

It is only mixed if you purchase that part #. If you purchase the other part #, it is not. The difference being weather you buy an extra quart of oil for $50 or the modifier for $6. Per my local dealer, they don't even stock the oil w/ mod because it is less expensive to add the mod separately.
Ok, thanks
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Old 05-17-2013, 12:18 PM
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Re: DIY- 2011 Differential Service/ Fluid Change

No problem!
And, BTW, the part #'s are correct in the thread you linked:
Synthetic 75w-85 Mopar p/n 05136035AA. Three qt required IF using in both axles/ 2 qt in only using in front (axle capacity 1.2 quarts)
Don't worry about the fact that it says "For use in Crossfire vehicles only" I had the parts guy use the "bat phone" to verify w/ Detroit.

Synthetic 75w-85 Mopar p/n 68083381AA (pre-mixed w/modifier). Requires 2 qt if using in rear axle (axle capacity 1.4 quarts)
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Old 07-30-2013, 01:18 PM
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Re: DIY- 2011 Differential Service/ Fluid Change

Glad to see that these differentials have drain plugs. My old 1998 Laredo that I had many years ago only had a fill plug. In order to drain the fluid from the diffs I either had to suck it out with a pump or remove the cover altogether. I always chose to remove the cover as it would drain all the contaminants out better and was able to inspect/clean the gears with the cover off. Much easier now with drain plugs just like the transfer case.
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Old 07-31-2013, 06:22 PM
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Re: DIY- 2011 Differential Service/ Fluid Change

I much prefer the plugs! On my Wrangler it is the same- you have to pull the cover I got frisky and welded a piece of flat stock to the cover then drilled and tapped a hole the same as for the fill plug. Bought an extra plug and voila! Fill and drain
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Old 09-17-2013, 08:40 PM
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Re: DIY- 2011 Differential Service/ Fluid Change

I will be tackling both diffs and the transfer case sometime in the next month or so. For the front diff, do you need to remove the front skid plate? I'm guessing yes.
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Old 10-02-2013, 08:58 AM
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Re: DIY- 2011 Differential Service/ Fluid Change

Quote:
Originally Posted by RageOfFury View Post
I will be tackling both diffs and the transfer case sometime in the next month or so. For the front diff, do you need to remove the front skid plate? I'm guessing yes.
Sorry I didn't see this. I need to subscribe to this thread.
If you mean the front suspension skid plate, then yes. I don't have the ORII package so no skid plate for me. It might be possible without removal but that oil stinks like a monkey cage. I wouldn't want to spill it on the top of the plate and have to smell it for months to come.
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Old 10-02-2013, 10:57 AM
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Re: DIY- 2011 Differential Service/ Fluid Change

Well done and thanks, plus rep.
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