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Unread 03-16-2008, 07:17 PM   #1
Mee_Too
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Replacing front & rear differential fluid?

Hello!

I was wondering if anyone replaced the fluid in the front and rear differentials as part of routine maintenance.

The owner's manual for my '99 does not call for it anywhere in the maintenance schedule, only mentions that the fluid should be 1/2" below the fill hole, and that SAE 75W-90 API-GL5 grade gear oil should be used (models with Class III hitch should use SAE 75W-140 Synthetic Gear Lubricant in the rear axle).

Just wondered if this lubricant is expected to hold up for the lifetime of the vehicle. I don't see any type of drain plug on either axle, so guess that only way to change would be to somehow pump out through fill hole.

Any ideas?

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Unread 03-16-2008, 07:22 PM   #2
murrayman23
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to drain the axle you have to take off the axle cover. You should take the cover off and clean out the inside with brake kleen or something.
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Unread 03-16-2008, 07:26 PM   #3
Mee_Too
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Quote:
Originally Posted by murrayman23 View Post
to drain the axle you have to take off the axle cover. You should take the cover off and clean out the inside with brake kleen or something.
Thanks! I'll have to set aside a chunk of time to do that one of these days.
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Unread 03-16-2008, 07:55 PM   #4
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Quote:
Originally Posted by Mee_Too View Post
Thanks! I'll have to set aside a chunk of time to do that one of these days.
It doesnt take that long, nothing to worry about at all.

-Kyle
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Unread 03-16-2008, 08:06 PM   #5
Mee_Too
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Quote:
Originally Posted by Kyle Deidrick View Post
It doesnt take that long, nothing to worry about at all.

-Kyle
Okay, thanks for the words of encouragement!

It seems strange that changing the fluid is never mentioned at all in the maintenance schedule (of course, come to think of it, I've never seen it mentioned in maintenance schedule of ANY vehicle).

I wonder why...seems like it would eventually break down or deteriorate at some point.
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Unread 03-16-2008, 08:15 PM   #6
sbxj
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From The FSM
60,000 Miles (96 000 km)

Change engine oil.
Replace engine oil filter.
Replace engine air cleaner element.
Replace ignition cables.
Replace spark plugs.
Inspect drive belt, adjust tension as necessary.
Lubricate steering linkage.
Drain and refill automatic transmission fluid.
Drain and refill transfer case fluid.
Drain and refill front and rear axles.‡
Inspect brake linings.
Lubricate steering and suspension ball joints.



should be done every 60k and you want to change it every time your axles have been exposed to water crossings


If you use a synthetic you could extend it to 120k
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Unread 03-16-2008, 08:18 PM   #7
XJ4oh
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Also, you do not have to pull the differential covers off to change it.

You can buy a cheap pump from Walmart or an auto parts store and suck the old stuff out, and pour the new stuff in.

When I changed mine it was probaly around 130k or so. It was most likely the origional fluid. It was grey (water/moisture) and smelled horrific.

Its cheap enough and easy preventative matinence.
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Unread 03-16-2008, 08:36 PM   #8
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I did mine around 70K miles when I first bought my XJ. The fluid was still clean, no metal shavings, didn't smell burned or anything. I took the covers off so I could replace the RTV around covers to make sure it wouldn't leak.

I decided to replace it with synthetic fluid as I was in the process of changing everything to synthetic. - got a good deal on myoilshop.com . They had quick shipping too.
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Unread 03-16-2008, 08:58 PM   #9
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Quote:
Originally Posted by BigDamnNose View Post
I took the covers off so I could replace the RTV around covers to make sure it wouldn't leak.
OK, that's another thing I wondered about...so RTV sealant is used, rather than a gasket.
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Unread 03-16-2008, 09:02 PM   #10
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Quote:
Originally Posted by Mee_Too View Post
OK, that's another thing I wondered about...so RTV sealant is used, rather than a gasket.
I use RTV but here is another option.

http://www.jeepinoutfitters.com/scri...?idCategory=98

-Kyle
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Unread 03-16-2008, 09:05 PM   #11
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Quote:
Originally Posted by Kyle Deidrick View Post
I use RTV but here is another option.

http://www.jeepinoutfitters.com/scri...?idCategory=98

-Kyle
That's a good idea...beats scraping the RTV off the next time.
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Unread 03-16-2008, 09:13 PM   #12
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Quote:
Originally Posted by BigDamnNose View Post
That's a good idea...beats scraping the RTV off the next time.
To my knowledge they are re-usable which is also a pretty nice benefit.

-Kyle
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Unread 03-16-2008, 09:14 PM   #13
Mee_Too
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Quote:
Originally Posted by Kyle Deidrick View Post
I use RTV but here is another option.

http://www.jeepinoutfitters.com/scri...?idCategory=98

-Kyle
Thanks for the link!
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Unread 03-16-2008, 09:28 PM   #14
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Quote:
Originally Posted by Kyle Deidrick View Post
I use RTV but here is another option.

http://www.jeepinoutfitters.com/scri...?idCategory=98

-Kyle
I take it those are reusable?

$32 vs $6
if not I'll stick with the blue RTV
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Unread 03-16-2008, 09:51 PM   #15
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I did both mine including transfer case yesterday.A piece of cake... other than the upper two bolts on the front cover are a little hard to get to with a socket.....and the idiot who did it last time thinks everything needs to be torqued at 120ft. lbs. and loctited also...

I try to do it once a year unless a submerge a axle...
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