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Old 11-27-2013, 05:28 PM   #1
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Changing diff fluid

Hey everyone,

I'm planning on changing the fluid in my front and rear diffs for the first time this weekend. I've never done it before so I have some questions, what kind of fluid should I use? Synthetic or normal. Should I use royal purple? I've heard that's a good brand. Should I use a gasket, sealant, or both? I have a 2012 wrangler Sahara with almost 26,000 miles.

Thanks in advance!

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Old 11-27-2013, 05:46 PM   #2
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I recently changed my differential fluid, painted the diff cover & used the Lube Locker gasket. I have been happy wih the Lub Locker gasket so far & it made it real simple when reinstalling the diff cover. I won't comment on the use of synthetic or normal fluid but as long as you use what is recommended in the owners manual you should be fine. Here is a good link for changing the differential fluid.

Project-JK.com - Jeep JK Wrangler Resource » MAINTENANCE: Jeep JK Wrangler Differential Fluid Service Write-Up

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Old 11-27-2013, 05:55 PM   #3
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I also use the Lube Locker no leaks and no mess! If you wheel or tow use the heavier weight when they give you a choice. I used Redline myself. Syn or Conv is really a Personal choice. Check everything real good for wear when you have covers off. May be a good time to upgrade diff covers if you see any rocks or plan to go where rocks may jump out at you.
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Old 11-27-2013, 07:04 PM   #4
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I just recently did mine. I also used Lubelocker gaskets; work great and worth the $ for me. I used synthetic 75W90 for the front and 75W140 for the rear. As far as brand that's up to you. Just make sure if you have limited slip it's compatible, which I believe most if not all the synthetics are. It will indicate it on the bottle. Use limited slip additive if you use conventional. If you have an open dif. it's not an issue. I also did my manual trans. with synthetic Amsoil Synchromesh and the transfer case with Amsoil synthetic ATF.
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Old 11-28-2013, 08:47 AM   #5
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Since I don't do any towing, should I use 75w90 in both the front and rear? Also I don't have a slip in the rear so is it still ok if I were to use synthetic? The write up is very helpful, thank you.
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Old 11-28-2013, 08:53 AM   #6
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Old 11-28-2013, 09:02 AM   #7
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you can still use synthetic, it won't hurt anything
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Old 11-28-2013, 09:23 AM   #8
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[QUOTE=DaK;6439978]Why are you guys taking off the covers?


I removed mine because I recently bought a used '08JKUR and I have no idea if PO did any maintenance on it. I cleaned out the gears, inspected them to see their condition. Also, the cover was rusty so sanded it & painted it.
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Old 11-28-2013, 10:45 AM   #9
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[QUOTE=ATX14;6440474]
Quote:
Originally Posted by DaK View Post
Why are you guys taking off the covers?


I removed mine because I recently bought a used '08JKUR and I have no idea if PO did any maintenance on it. I cleaned out the gears, inspected them to see their condition. Also, the cover was rusty so sanded it & painted it.
Stock covers are junk aren't they? I upgraded rear to ARB and just ordered one for the front too. Difference in strength and quality vs stock is day and night!
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Old 11-28-2013, 01:07 PM   #10
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I definitely plan on upgrading but I currently have a trac bar bracket that ties into the diff cover. I plan on removing the current lift ( Skyjacker) & upgrading it. I'll replace the diff cover then.
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Old 11-28-2013, 02:49 PM   #11
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Quote:
Originally Posted by DaK View Post
At the end of the link you posted it says this:

Thorough Fluid Change Instructions
In order to perform a thorough differential fluid change, you will be required to remove your differential covers.

It's worth the extra time and if you use Lube Lockers it's really easy.

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