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Unread 03-16-2008, 11:17 PM   #16
TreddyoXJ
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I manage a quick lube and this is the procedure I mandate for Jeep differentials:

1. You don't need bother with removing the cover unless you would like to have a new differential cover gasket. The fluid can be effectively changed without taking off the cover.
2. We utilize a pneumatic pump (Graco "Diff Sucker") to suck the fluid out through the fill plug. Any type of pump will for for the job, including ones that you find at the auto parts store or Wal Mart, the pneumatic one is expensive but extremely fast.
3. Make sure the suction tube is at the bottom of the differential when you're removing the old fluid.
4. When the differential starts to get empty, spray the inside with a little bit of brake cleaner through the fill hole and let it sit for a minute. Then pump or pour in a little bit of the new fluid (1/2 pint or slightly less). This is kind of like a flush for what's left inside of the differential. Proceed to suck this fluid out also.
5. Once all of the fluid is removed, add until the gear lube starts to ooze out of the fill plug. Let it ooze until it's barely coming out anymore and then plug it up.

You now have new gear lube. I have nothing against removing the cover by the way, this is just an easier/quicker way to do it if there's really no need to take off the cover. In regards to service intervals, the condition should be checked every 15,000 miles, or more frequently with water crossings. I check mine every time I change the motor oil.

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Unread 03-17-2008, 12:22 AM   #17
Highway 4x4
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And if you have the factory possi add the friction modifier.
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Unread 03-17-2008, 06:50 AM   #18
shouston75
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Quote:
Originally Posted by sbxj View Post
I take it those are reusable?

$32 vs $6
if not I'll stick with the blue RTV
http://www.lubelocker.com/why.html

Quote:
Q: Is this gasket reusable?
A: Probably a few times. We will not endorse reuse. We will tell you that people have done it and it has worked. We will not tell you how many times. It depends greatly on the application, interval between disassembly, and "environmental factors".
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Unread 03-17-2008, 10:30 AM   #19
RacecaR
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If you decide to pop the cover and spray everything with brake cleaner- unbolt all of the bolts, except leave the top one loose. This way when you break the seal, the diff cover "hangs" instead of possibly falling into used oil.
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Unread 03-17-2008, 10:56 AM   #20
mecompco
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Quote:
Originally Posted by sbxj View Post
I take it those are reusable?

$32 vs $6
if not I'll stick with the blue RTV
LubeLocker does not specifically say you can reuse them, but rather that some have reused them two or three times. I've reused the one on my 8.8 once now with no leaks. If you figure in the time saved scraping off sealant, it helps make the cost more palatable.
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Unread 03-28-2008, 11:18 AM   #21
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I just got back from having the oil/lube done on my '06 Unlimited. I have 24K miles on the jeep and the guy at the lube shop told me that I needed to change the differential fluids every 12K miles. From what I read here, it seems like I don't need to worry about this until about 60K miles. The jeep hasn't been in water.

Thoughts?
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Unread 03-28-2008, 11:30 AM   #22
Jason, aka: Jeepin.com
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Personally I'd probably do it about every 30K, but 60K is probably fine if you're not in water much. With the amount of work I do on our rigs, I rarely pay attention to mileage intervals when it comes to changing our diff fluid. (though it is time for me to change the diff fluid in our truck...). I've always pulled the covers off to change the fluid (even on my MIL's WJ), if for no other reason than to inspect the differential and gears.

Regarding LubeLockers, we run them front/rear on both our Jeeps and they've worked really well. I hate dealing with the mess and hassle of RTV, so even if they weren't very reusable, I'd still use them. I think we're up to like 4-5 uses on the rear of our TJ with no leaks so far. One side benefit to them is they make trail side repairs in your diff a lot nicer and easier vs using RTV.
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Unread 04-05-2008, 11:38 AM   #23
sbxj
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Quote:
Originally Posted by Ultramag View Post
I just got back from having the oil/lube done on my '06 Unlimited. I have 24K miles on the jeep and the guy at the lube shop told me that I needed to change the differential fluids every 12K miles. From what I read here, it seems like I don't need to worry about this until about 60K miles. The jeep hasn't been in water.

Thoughts?
after I had my 8.25 replaced under warranty at 50k the Dealer told me it was recommended to replace the fluid at 12k also
He said the 8.25 has been prone to failure due to lack of maintenance
They also put synthetic in the diff
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Unread 04-05-2008, 12:46 PM   #24
asp87
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Quote:
Originally Posted by sbxj View Post
I take it those are reusable?

$32 vs $6
if not I'll stick with the blue RTV
either way i'm sticking with the 6 dollar option. a wire wheel on a drill gets it all off the cover nicely anyway.
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Unread 04-05-2008, 01:18 PM   #25
sprintagogo
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On landrovers we always use paper gaskets(more like thick card really) to fit the third member diffs into the axle. I am tempted to try and make one as it is available in sheets and if greased before installation they can be re-used providing it doesn't stick and tear during removal. shop purchased paper gaskets cost about 2 or $3-4
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Unread 04-18-2008, 01:13 AM   #26
Matte36m3
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I just joined the forum and am really happy to be back in an XJ again. I previously had a 1996 Country and put 60k hard Colorado mountain miles on it without a single problem. I loved that Jeep and wish that I had never sold it!

Bored at work last week, I happened across the GSA auction listing online for the upcoming auction near my parents in Northern Virginia and saw a 2001 Cherokee Sport with a little over 14k miles on it. One week later and now it's waiting to be picked up by me in my parents' driveway!

The vehicle appears to be in excellent condition save for a few scratches and some faded door ding guards. Given that the vehicle is 7 years old, should I go ahead and change the auto tranny, transfer case and diff fluids or should I wait until it hits 30k? It will serve as a winter driver and summer camping vehicle, but no serious off roading. Also, do any of you know of a good product to renew the plastic bumper guards and door guards?

Thanks in advance for your help!
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Unread 04-18-2008, 05:45 AM   #27
xjarchaeologist
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It's easy to do, and why not? I did my rear one last year (never got to the front). It was pretty bad stuff. I'm doing both, the t-case, transmission, and engine tomorrow...Fun stuff, fluid changes...
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Unread 08-28-2008, 05:28 PM   #28
dhowell
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I have a Jeep Cherokee 1999 Sport 4WD and plan to change the gear lubricant in both front and rear. I purchased 4 quarts of gear lubricant at the Jeep dealership today. When I got home, I noticed that I was sold 80W/90 instead of 75W/90 as the owners manual called for. Do I have the wrong lubricant?
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Unread 08-28-2008, 07:51 PM   #29
dakotajeep
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The manual calls for 75W90. Personally, if its not far I would exchange it.
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Unread 08-29-2008, 06:35 AM   #30
fourtwenty
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Quote:
Originally Posted by Highway 4x4 View Post
And if you have the factory possi add the friction modifier.
Is there an easy way to tell if you have the factory posi? I'm going to be changing my rear fluid soon. I have the 8.25 rear end.
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