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I just had my rear diff seals replaced under warranty, but the dealership forgot to replace the rear diff fluid (I was actually paying for this) so I decided to change it myself. It was easy, but I found a bunch of large metal pieces on the drain plug (7/4).

Fast forward to today (7/18) and the dealer is telling me that it is normal for the clutch plates to wear and throw off metal pieces.

What do you guys think, Normal? I am really tempted to get @JeepCares involved b/c the dealer is refusing to open the rear differential and visually inspect the clutch pack / spider gears.
 

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It has been said many times that this will happen about 20k miles or so. It should be covered under the 60k drivetrain warranty. My Willys has the optional rear locker so no clue if something similar will happen with it.
 

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Those look like spider gear teeth to me. If your dealer pulls the diff cover they should be able to confirm. Mine were chipped up at about 20K miles (found when doing a regear). I oped to skip the warranty replacement and went with a TrueTrac so I would not have to hassle with it again in another 20K. After regear my warranty would be void anyway. I believe they are a defective design. No reason spiders should chip at 20K.
 

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Definitely spider gears caused by the clutch pack being worn out. You can see if jeep cares, but..... Its worth upgrading to a better diff!
 

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I just had my rear diff seals replaced under warranty, but the dealership forgot to replace the rear diff fluid (I was actually paying for this) so I decided to change it myself. It was easy, but I found a bunch of large metal pieces on the drain plug (7/4).

Fast forward to today (7/18) and the dealer is telling me that it is normal for the clutch plates to wear and throw off metal pieces.

What do you guys think, Normal? I am really tempted to get @JeepCares involved b/c the dealer is refusing to open the rear differential and visually inspect the clutch pack / spider gears.
Hi opelgt21,
We understand why this may be concerning. We'd be happy to have a case escalated for you so a Case Specialist can work with your dealer to help you get this inspected. Please send us a private message at your earliest convenience.

Lydia
Jeep Social Care Specialist
 

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Mine went too about the same 20K or so. I drive a lot off road and on slippery roads in the winter. First time it was replaced under warranty. I just regeared at 34K or so and had it replaced with a TruTrac - Trac-Lock showed significant signs of wear.
 

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When it comes to the limited slip differential, failure is "normal wear". It's very common for the spider gears to fail early, probably because of faulty parts.

Definitely pursue this because it's only going to get worse.

Unfortunately, the dealer can only replace the Trash-Lock with another Trash-Lock. You can't get them to put in a better differential under warranty.

It may be worth it to punt on the dealer and get another shop to put in a good limited slip or locker instead.
 

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That’s not normal wear. Same thing happened to mine. Changed the oil at 30k and same thing came out. Dealer replaced no hassle and it’s been fine since. Although it’s now got about 20k on the new one. Driving it cross country next month. Half tempted to check, but most likely just gonna let it ride until 60k when I replace all the other fluids. It’s running fine now...all my driving has been pretty much dry paved roads so I don’t know how long it will last. The 2 year warranty will be expired by then (powertrain expired in May...2 years is up in October), but I don’t think I want another one if they spit out spider gear teeth every 20-30k.
 

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The clutch packs die early... Somewhere between 20K and 40k miles. They do not cause the spider gears to go. That is a warranty repair.
 
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