Differential fluid change - Page 2 - JeepForum.com

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post #16 of 30 Old 10-05-2010, 10:27 AM
JerseyGeorge
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Spin it any way you want! 46000 miles and going strong.....NO chatter when turning....FLAWLESS operation in the deep snow we had last year.......PERFECT on the beach and dunes in NC!! Guess my Jeep is one of the "most" class

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post #17 of 30 Old 10-05-2010, 04:44 PM
5318008
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Correct me if I'm wrong, but QT1 and QT2 have open differentials front and rear, and therefore, should not require a limited slip friction modifier.
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post #18 of 30 Old 10-05-2010, 06:46 PM
kentman
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Originally Posted by 5318008 View Post
Correct me if I'm wrong, but QT1 and QT2 have open differentials front and rear, and therefore, should not require a limited slip friction modifier.
Sounds right to me. I have QD and QD-II on the WJ and XK, and that requires the modifier.

I cannot tell what JerseyGeorge has got. If he is QT1 or QT2, then that would explain why he has no issue without the modifier.

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post #19 of 30 Old 10-06-2010, 01:17 AM
JerseyGeorge
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Originally Posted by kentman View Post
Sounds right to me. I have QD and QD-II on the WJ and XK, and that requires the modifier.

I cannot tell what JerseyGeorge has got. If he is QT1 or QT2, then that would explain why he has no issue without the modifier.
I have the QD II and yes it requires the additive modifier unless the gear oil your replacing it with has the friction modifiers in it. Since I use Mobil 1 75/140 gear lube and it has the friction modifier I don't add any and it has worked flawlessly!! NO chatter.....super performance in the snow and sand/dunes in NC!

I'm not telling people friction modifier isn't needed but I'm pointing out Mobil One, Amsoil and Royal Purple to name a few come with the friction modifiers in them already so NO additional FM is needed!
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post #20 of 30 Old 10-06-2010, 05:50 AM
kentman
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Originally Posted by JerseyGeorge View Post
NO chatter.....super performance in the snow and sand/dunes in NC!


This is not the same for everyone. Others have complained about issues without the modifier when using Mobil 1 LS. I add the modifier, and I have no issues when adding it. I have never tried without, and I do not plan to try without.

If I were you, I would try to do some figure eights and see if you get any binding or hopping. On sand or snow going straight, you may get even slip on all wheels and not see the issue. Doing figure eights on flat ground, you may see more.

'06 XK Limited, 5.7L, QD II, Black, 155K
'02 WJ Overland, 4.7L HO, QD, Inferno Red, 118K
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post #21 of 30 Old 10-06-2010, 10:08 PM
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This is not the same for everyone. Others have complained about issues without the modifier when using Mobil 1 LS. I add the modifier, and I have no issues when adding it. I have never tried without, and I do not plan to try without.

If I were you, I would try to do some figure eights and see if you get any binding or hopping. On sand or snow going straight, you may get even slip on all wheels and not see the issue. Doing figure eights on flat ground, you may see more.
I guess I have a "special" Jeep

I don't do figure eights on the street or off-road so why would I do that? I assure you when driving in the snow and the beach I made a couple turns......some even sharp turns. NJ is full of sharp turns, off-ramps, u-turns, besides This isn't my first rodeo!
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post #22 of 30 Old 10-07-2010, 04:35 AM
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Personally, I would rather not play with fire over $10 on a bottle of friction modifier. Worst case if I am wrong, I am "throwing $10 away" every 15K miles. I can live with that. Different strokes for different folks.

'06 XK Limited, 5.7L, QD II, Black, 155K
'02 WJ Overland, 4.7L HO, QD, Inferno Red, 118K
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post #23 of 30 Old 10-07-2010, 07:33 AM
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I add the modifier even with M1. I've gotten chatter from the rear while doing tight figure 8's. It's $7 from the dealer here. Buy one bottle just in case, allow for a few ounces to be added, and add it as needed.

There's a common brand that is always in advance or auto zone around here. Don't be tempted if you run across it. It says in fine print that it's not for the GC LS's

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post #24 of 30 Old 10-07-2010, 07:52 AM
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Make sure you buy some break cleaner to spray out the diff when the covers off! It makes a huge difference!
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post #25 of 30 Old 10-24-2010, 03:13 PM
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?

im getting ready to change mine why would wiping the oil off the diff covers with brake cleaner make a huge diff ?????that little bit of old fluid on them cant add up to an ounce.if their that sensitive i think this thing will be sold as quick as i bought it
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post #26 of 30 Old 10-24-2010, 03:49 PM
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Originally Posted by tazer15 View Post
im getting ready to change mine why would wiping the oil off the diff covers with brake cleaner make a huge diff ?????that little bit of old fluid on them cant add up to an ounce.if their that sensitive i think this thing will be sold as quick as i bought it
If you're going to change it you may as well do it right. Getting the cover off and draining the fluid then reinstalling all the above is the hard part. Spraying a can of brake cleaner is cheap and EASY!
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post #27 of 30 Old 10-24-2010, 08:12 PM
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Quote:
Originally Posted by acort View Post
Make sure you buy some break cleaner to spray out the diff when the covers off! It makes a huge difference!
Quote:
Originally Posted by tazer15 View Post
im getting ready to change mine why would wiping the oil off the diff covers with brake cleaner make a huge diff ?????that little bit of old fluid on them cant add up to an ounce.if their that sensitive i think this thing will be sold as quick as i bought it
acort was saying to spray down the gear set, not just the diff cover.

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post #28 of 30 Old 10-25-2010, 09:34 AM
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Spraying down the gear set with brake parts cleaner will help you during the inspection you are doing while changing the fluid (you are inspecting, right?). Gets everything clean and shiny so you can look for abnormal wear on the ring, chips, etc.

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post #29 of 30 Old 10-25-2010, 09:43 AM
djfxall
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are there limited slip tags on the diff if the fluid is needed?
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post #30 of 30 Old 10-25-2010, 10:20 AM
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Quote:
Originally Posted by acort View Post
Make sure you buy some break cleaner to spray out the diff when the covers off! It makes a huge difference!
That's usually not a good idea. Brake cleaner usually leaves a residue. If you have water in your diff, then you should...but if not you really shouldn't.

Honestly, if you have QT2 do yourself a favor and go to riddler and pick up a new rear diff cover. Stock cover is a piece of foil compared to it. lol Not a bad price either.

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