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Unread 03-18-2005, 08:03 AM   #1
JEEPREBEL
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Changing Differential Oil

I was wondering if it was possible to change the gear oil in the front and rear diffs with out taking the covers off. Could i use a suction device made for grese and pump it out? Or is it better to take the covers off and do it that way?

Thanks Chris

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Unread 03-18-2005, 08:12 AM   #2
wayoflife
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while it can be done and for whatever it's worht, that's how most oil change places do it, i wouldn't recommend it. pulling your diff covers give you a chance to inspect your gears and to make sure everything looks good. it will certianly allow for a more throuogh cleaning and it really isn't that hard to do.

Click here to see my Differential Fluid Change write-up

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Unread 03-18-2005, 08:13 AM   #3
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Take the covers off... there's no other way to be sure you've gotten all the fluid out for one. Also, you'll want to check the gears for wear, look at the inside of the housing for any metal shavings, and clean out the inside of the cover and diff. No point in putting fresh lube in there if you leave all the crud and a bit of old dirty lube in there as well.
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Unread 03-18-2005, 08:27 AM   #4
linux24
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Quote:
Originally Posted by JEEPREBEL
I was wondering if it was possible to change the gear oil in the front and rear diffs with out taking the covers off. Could i use a suction device made for grese and pump it out? Or is it better to take the covers off and do it that way?

Thanks Chris
Is it possible? Given enough time, money, and energy, anything is possible.

I wouldn't do it. Part of changing that fluid is spraying brake cleaner up in there to remove grime and grit from inside the gears, and wiping crud from inside the assembly as much as possible and the inside of the cover. It also is a chance to perform an inspection to see if you see filings in there.
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Unread 03-18-2005, 09:06 AM   #5
FlyersFan2009
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I concur with the above posts.

Take the covers off and follow WayofLife's write up.


You should inspect the gears and check for metal in the bottom of the pumpkin.
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Unread 03-18-2005, 11:27 AM   #6
BluesMan
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Yup what they said.

It would be wize to read the write ups or FSM before you do this, if you have not done it before.

The project is one of the simplest to do.

I did this a couple of weeks ago and forgot to leave a couple of bolts connected at the top. Then went to take the cover off and it fell into the diff fluid below sending the stinking crap all over me and my garage.
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Unread 03-18-2005, 03:47 PM   #7
JEEPREBEL
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Honestly this was one of the easiest things Ive ever done to my jeep other than changin engine oil. Thanks Wayoflife the write up was really helpful.

Thanks, Chris
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Unread 03-18-2005, 04:09 PM   #8
Ludoc
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Dude... This is the WORST part of servicing my TJ. I hate taking the covers off. However, after much debate and listening to the peeps around here, I have just come to live with removing the covers. It seems like the best option. Do a search with my name and look for a thread about some diff covers I was going to buy with a drain plug in them. EVERYONE basically told me to just live with it. I tend to listen to experience. I tried the suck gun method. It... well, sucks. Take the covers off. Basically get it in your head. Prepare for it if you hate it like I do.

Ok... I am done ranting.
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Unread 03-18-2005, 04:42 PM   #9
KaiserJeep
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One little tiny feature that Jeep didn't even advertize about the Rubicon makes me very happy. The front and rear D44's have magnetic drain plugs to drain the lube.

At 6000 miles I did remove the diff covers and spent some time cleaning out as much of the black stuff as I could get (it's oxide from the surface treatment). Since then I just pull both magnetic plugs and providing there is no metal debris on the plugs, drain and refill with lube. It saves time and no worries about a leak.
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Unread 03-18-2005, 08:00 PM   #10
JEEPREBEL
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It wasnt too bad...the worst part was puttin the oil in the front diff (dont have a pump). So yeah it sucked.

Chris
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Unread 03-18-2005, 08:30 PM   #11
Chile99
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Next time you do the front diff, stop at the hardware store and buy 3 foot of clear plastic 3/8 inch flexible plastic tubing, put squueze bottle of diff fluid into one end of the tubing and the other end into the opening of the diff cover...........squeze.
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Unread 03-18-2005, 08:45 PM   #12
BlueJ
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SO what weight oil did you use and did you need the friction additive?
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Unread 03-18-2005, 08:52 PM   #13
Stu Olson
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FSM call for 80W-90 or 75W-140 synthetic (the heavier if you tow or subject the axle to heavy use).

Friction modifer is used if you have a clutch pack LSD like the factory LSD option. Most gear lubes come with the friction modifier in them. Check the label to be sure.
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Unread 03-18-2005, 09:24 PM   #14
BlueJ
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And what like 3 quarts I suppose?

Hey Stu, what brand is a good synthetic?
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Unread 03-18-2005, 09:51 PM   #15
Stu Olson
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I use Mobil1 myself. Redline makes a good synthetic gear lube.

http://www.stu-offroad.com/misc/maint.htm gives you quantities for fluids among lots of other common maintenance info.
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