What is this? Washer found in rear diff - Rubicon Owners Forum
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post #1 of 13 (permalink) Old 07-25-2019, 11:18 AM Thread Starter
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What is this? Washer found in rear diff

My rear locker stopped working last trip due to not holding air. I finally got a chance to pop the cover and found this little shim or washer(?) Lying at the bottom of the diff. It sliced a small hole in the air hose which explains why I couldn't hold pressure but I'm not sure where this came from.

Could this be one of the clutch plates thats part of the limited slip? Should I try to rebuild the LSD portion or start searching for a front locker to swap in?
Attached Images
File Type: jpg diff.jpg (174.9 KB, 13 views)
File Type: jpg diff2.jpg (104.7 KB, 12 views)
File Type: jpg Diff4.jpg (152.0 KB, 12 views)
File Type: jpg diff3.jpg (73.8 KB, 96 views)
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post #2 of 13 (permalink) Old 07-25-2019, 05:03 PM
DAA
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TJ Rubicon LSD is gear driven. No clutches.

Can't help in identifying that piece.

- DAA
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post #3 of 13 (permalink) Old 07-25-2019, 08:51 PM
Rubicus Maximus
 
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If I had to guess I would say is a pinion shim
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post #4 of 13 (permalink) Old 07-25-2019, 09:49 PM
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What is the diameter of the piece... carrier shim/pinion is a good guess I would think.

Before disassembly I would check the side play of the diff and see if its out by the thickness of the shim...same with the pinion see if the preload and backlash are in spec. DO it all before disassembly.

Like was said above there is NO clutch in the LSD it is a gear unit.

Oil seals intact?
added...
the size compared to the quarter is throwing me.

the pinion shims are under the bearing cup I think, so carrer shim is more likely, but it looks too small,

looking again it may be part of number 48.
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Last edited by SteveVB; 07-25-2019 at 09:55 PM.
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post #5 of 13 (permalink) Old 07-25-2019, 11:08 PM
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I had this exact same thing with my 05 PM. It was the pinion shim. Warranty item.
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post #6 of 13 (permalink) Old 07-26-2019, 09:20 AM Thread Starter
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Quote:
Originally Posted by DAA View Post
TJ Rubicon LSD is gear driven. No clutches.

Can't help in identifying that piece.

- DAA
Didnt know that ...thanks!

Quote:
Originally Posted by MxRubicon View Post
If I had to guess I would say is a pinion shim
I'm thinking you might be right...weird that it spit loose after 116k miles. I was just in there maybe 10k ago fixing a leaky airline and it definitely wasnt there

Quote:
Originally Posted by SteveVB View Post
What is the diameter of the piece... carrier shim/pinion is a good guess I would think.

Before disassembly I would check the side play of the diff and see if its out by the thickness of the shim...same with the pinion see if the preload and backlash are in spec. DO it all before disassembly.

Like was said above there is NO clutch in the LSD it is a gear unit.

Oil seals intact?
added...
the size compared to the quarter is throwing me.

the pinion shims are under the bearing cup I think, so carrer shim is more likely, but it looks too small,

looking again it may be part of number 48.
Oil seals are good. Pinion shim is probably the best bet based on size but the pinion is still tight and there is zero signs of leaking or movement so I'm confused why it decided now was a good time to crap out

Quote:
Originally Posted by Stinger View Post
I had this exact same thing with my 05 PM. It was the pinion shim. Warranty item.
No kidding - from the factory? I've never heard of this being a known issue. How many miles were on yours when it happened? Did they say it was just a poor install?
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post #7 of 13 (permalink) Old 07-26-2019, 10:08 AM
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They didn't say and I didn't ask!
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post #8 of 13 (permalink) Old 07-27-2019, 07:28 PM
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Quote:
Originally Posted by Tonellin View Post

Oil seals are good. Pinion shim is probably the best bet based on size but the pinion is still tight and there is zero signs of leaking or movement so I'm confused why it decided now was a good time to crap out
Get a dial gauge on it see what the backlash is, dial the diff side play and put a torque wrench on it for the pinion bearing preload...only way I could see pinion shims ripping and failing is if pinion preload was off, either from wear or poor install.

if you have done work on it recently then I would look hard at anything that was done.

Steve

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2013 crush JKU AEV bling 285/75-17s

2006 TJ project truck GR8Tops, flat fenders , 34s , 6' bed are the plan
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post #9 of 13 (permalink) Old 08-01-2019, 08:40 PM
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TJ Rubicon D44 rear has both a clutch pack friction media limited slip, as well as the dog gear clutch air locker in it. The limited slip function is always active in the rear and the locker is on demand. The part looks like a broken beleview spring washer from the clutch pack. Needs a rebuild to bring back to spec. The front TJ Rubi D44 does not have the clutch pack limited slip feature. Only the air locker.
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post #10 of 13 (permalink) Old 08-01-2019, 09:01 PM
DAA
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Quote:
Originally Posted by wolfstar View Post
TJ Rubicon D44 rear has both a clutch pack friction media limited slip, as well as the dog gear clutch air locker in it.
Not from the factory they didn't.

- DAA
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