Differential lube fluid? - JeepForum.com
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post #1 of 84 Old 02-13-2011, 01:14 PM Thread Starter
taoshum
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Differential lube fluid?

When a dealer in PHX did the latest recall they told me that I needed to change the front and rear differential lube fluid, every 15,000 miles... especially after the first 15,000 miles.

I told 'em I didn't have time when I was there 'cuz I wanted to find out if it's true? Is it? The service bay guy says it's because of the limited slip differential.


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post #2 of 84 Old 02-13-2011, 01:29 PM
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The time requirements for changing differential fluid are going to vary based on driving conditions (do you tow, off road, etc...)

I just did my rear differential at slightly over 15K and it needed it. FWIW, you can do this service in your own garage or driveway (if you can get away with it). It is pretty simple.
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post #3 of 84 Old 02-13-2011, 01:35 PM
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It's an easy task. Most auto parts stores will take the used oil.
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post #4 of 84 Old 02-13-2011, 01:39 PM
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If you do any off-road or towing definitely needed and also check the OM. Yup, easy to do with a small kit I got at the local auto parts shop, suction it out, fill it up, and they take the old fluid for free.

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post #5 of 84 Old 02-13-2011, 01:54 PM
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Why use suction for the change when the diffs have drain plugs? What's the OM?
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post #6 of 84 Old 02-13-2011, 02:14 PM
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I did a full change with mine.

Drained the differential, pulled the cover, cleaned everything with brake cleaner and then refilled.

Make sure you pay attention when draining and think you have the drain bolt removed when it's really only the fill bolt. The resulting oily sludge that pours out when you knock the cover off with the BFH isn't too pleasant. (I don't know anyone who actually did this, I'm just sayin")
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post #7 of 84 Old 02-13-2011, 02:41 PM
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Maybe your diff cover has a drain plug, mine does not front or rear, that I could readily see. Just followed the maintenance manual though....guess there is a problem sometimes in just RTFM...is there a plug in the housing itself? Always willing to learn.

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post #8 of 84 Old 02-13-2011, 04:01 PM
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what brand fluid do you guys recommend?? also synthetic or not??
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post #9 of 84 Old 02-13-2011, 04:02 PM
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Quote:
Originally Posted by RockyClymer
Maybe your diff cover has a drain plug, mine does not front or rear, that I could readily see. Just followed the maintenance manual though....guess there is a problem sometimes in just RTFM...is there a plug in the housing itself? Always willing to learn.
If you have JK axles, you have differential drain plugs. They are located at the bottom of the housing. Not on the cover.

You need a 3/8 socket extension the back them out.

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post #10 of 84 Old 02-13-2011, 04:07 PM
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Quote:
Originally Posted by i_love_my_jeep View Post
what brand fluid do you guys recommend?? also synthetic or not??
Some people swear by synthetics, I went with Mobil Brand Gear Fluid only because of the cost.
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post #11 of 84 Old 02-13-2011, 04:17 PM
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OK, guess I did not see them - sounds like need to insert the end of a 3/8 drive then....tnx, live and learn I hope.

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post #12 of 84 Old 02-13-2011, 04:30 PM
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Originally Posted by RockyClymer View Post
OK, guess I did not see them - sounds like need to insert the end of a 3/8 drive then....tnx, live and learn I hope.
Yep, definitely beats the hell out of trying to suck them out.
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post #13 of 84 Old 02-14-2011, 07:47 AM Thread Starter
taoshum
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Quote:
Originally Posted by i_love_my_jeep View Post
what brand fluid do you guys recommend?? also synthetic or not??
Are there any "additives" needed for the limited slip feature? The d/stealer said it's a "special" fluid for limited slip?

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post #14 of 84 Old 02-14-2011, 07:49 AM
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I used Royal Purple front & rear. Easy job to do yourself.

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post #15 of 84 Old 02-14-2011, 07:53 AM
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Yes you need to use oil that has a Limited Slip additive. Try Royal Purple Synthetic and it has the additive included.
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