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Old 02-23-2019, 01:57 PM
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Limited slip issue

2014 6sp willys new to me last August, I often hear a clunking from take off especially once its been run for a while.

Last week we had a ton of ice and I got stuck with just the back right spinning. No matter how little or how much throttle I gave it the back left never engaged even when it was on dry cement and only the back right was on ice it just spun I tested this more then a few times.

Being new to the Jeep scene I had brought it in for the clunk a few months ago to my local dealer to have it checked and they talked me into getting what they called "peace of mind inspection" I asked them to pay special mind to the rear diff where I assume the sound is coming from. All checked out according to them.

My powertrain warranty is up in April so I have an appointment with them this Tuesday to inspect my the limited slip not engaging. Am I right in thinking theres a issue if only the back right spins and the left never engages meaning I have an issue with the limited slip?
Thanks in advance.

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Old 02-23-2019, 02:28 PM   #2
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The clutches in the differential are most likely worn, that's why it's acting like an open diff. Should be covered under your powertrain warranty. If you look through the forume, there's quite a few threads with people who have them replaced around 25-30k miles because they wear out.

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Old 02-23-2019, 05:01 PM
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Thanks Ghost, I have been reading through the Forum and just want to make sure when I push warranty I know what im talking about. They tried telling me it was normal until I slowly explained what little I know about LSD even then a mechanic came out and tried selling me on it likely just needing a diff oil change to which im skeptical and ill be sure to be there when they pop the cover off so I can see it myself so they dont blow me off again and I get past April when my warranty is done. I will update after it goes in Tuesday
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Old 02-24-2019, 02:01 AM   #4
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Just replaced my clutches at 71k miles. I can say it's been slipping since before 50k miles. (With oil changes per service schedule.)

The outer clutches on both sides were worn down to the metal at 71k miles.
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Old 02-24-2019, 11:51 AM   #5
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For the price of the LSD rebuild kit you can replace the LSD with a TruTrac Mechanical LSD and not worry about clutches again. One of the best mods I did.


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Old 02-24-2019, 01:16 PM   #6
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For the price of the LSD rebuild kit you can replace the LSD with a TruTrac Mechanical LSD and not worry about clutches again. One of the best mods I did.


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On my 2014 JKU, my spider gears were all chipped up. Could have replace the LSD under warranty. I opted to pay to replace with TruTrac instead. Factory LSD has issues in my opinion.
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Old 02-24-2019, 01:42 PM   #7
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For the price of the LSD rebuild kit you can replace the LSD with a TruTrac Mechanical LSD and not worry about clutches again. One of the best mods I did.


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The clutch kit (spicer) was only $130 and did the install my self.

The TruTrac install is much more involved too. I will be going with some kind of locker next time though.
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Old 02-24-2019, 06:19 PM   #8
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The clutch kit (spicer) was only $130 and did the install my self.



The TruTrac install is much more involved too. I will be going with some kind of locker next time though.


The rebuild kit I speak of includes replacing the spider and axle side gears as well as the clutches.. Usually by the time the clutches go the spiders are also worn or chipped. This kit is about the same price as a TruTrac


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Old 02-25-2019, 04:13 AM   #9
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had my oe lsd replaced at 26k and 50k under warranty. going with a true trac this spring
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Old 03-01-2019, 05:46 PM
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Update,
Went in Tuesday at 1 got a call at 4 saying the rear end is toast and they would need to order parts to replace the axle and pretty much everything else. Not sure what all it will need but I am interested in going to true trac at this point. I asked about my LSD and the service manager said they hadnt even gotten to that as soon as they seen my diff off she called and told me it was undrivable. I asked her how in the span of a few months since having brought it in for clunking when taking off with special attention to be made to the rear diff that I was told it was fine but now its destroyed... they dint have an answer but on a place they gave me a 2019 Durango Citadel until they get it sorted and I do miss my jeep but the heated steering wheel and extra power are easing my wait.
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Old 03-25-2019, 04:52 PM   #11
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Interesting. I have a 14 JKU Willys with 3.73 and OEM LSD in rear.
Last week, at 58000 miles rear axle broke. Rear driveshaft was spinning and 0 power to wheels. After towing it did the opposite and seized.
Pin put a hole in the cover and whole bunch of stuff broken inside.
LSD was working fine until that though.
Powertrain warranty covered it. It didn't cover brackets for hand brake or cracked rear rotors (not sure when that happened) around the 'hat'
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Old 03-25-2019, 05:25 PM   #12
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Update,
Went in Tuesday at 1 got a call at 4 saying the rear end is toast and they would need to order parts to replace the axle and pretty much everything else. Not sure what all it will need but I am interested in going to true trac at this point. I asked about my LSD and the service manager said they hadnt even gotten to that as soon as they seen my diff off she called and told me it was undrivable. I asked her how in the span of a few months since having brought it in for clunking when taking off with special attention to be made to the rear diff that I was told it was fine but now its destroyed... they dint have an answer but on a place they gave me a 2019 Durango Citadel until they get it sorted and I do miss my jeep but the heated steering wheel and extra power are easing my wait.

if your under warranty, then thats fine that they want to replace the rear axle. if this isnt covered by warranty, then they are likely trying to take you for a ride! what happens is the spider gears get chipped because the clutch pack wears out. they were probably seeing chunks of spider gear which is not too big a deal. just involves replacing the spider gears and clutch pack, which you could do at home in an hour or so, 2 hours if you are nervous and have never done it before.
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Old 03-25-2019, 09:30 PM   #13
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The factory LSD was toast on my 2016 at 18,000 miles. Replaced it with an Eaton E-Locker and have not looked back.
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Old 03-25-2019, 09:59 PM   #14
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My 18 JK Willys came with the optional rear locker and I just added the D30 trutrac to the front axle. Maybe it's just me but it now feels much better on wet pavement and that's huge since Mobile, Al is the rainiest city in the country.
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Old 03-26-2019, 09:22 AM   #15
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I've had the LSD replaced twice in nearly 130,000 miles.
I have MaxCare so I'll keep the OE LSD as long as they keep replacing it....
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Old 03-26-2019, 01:22 PM   #16
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The rebuild kit I speak of includes replacing the spider and axle side gears as well as the clutches.. Usually by the time the clutches go the spiders are also worn or chipped. This kit is about the same price as a TruTrac


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if you can get it under warranty obviously do that. but if its out of pocket get rid of the TRASH-loc and get a tru-trac.

my 12 lasted 70000 km and the 18 15000km i'm sure its my driving/ wheeling that killed it so quick but all clutch LSD's have a limited lifespan.
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Old 03-26-2019, 01:32 PM   #17
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Just curious but what's the lifespan of one with just highway miles?
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Old 03-26-2019, 04:32 PM   #18
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Just curious but what's the lifespan of one with just highway miles?
For mine 14 model year rear axle with factory 3.73 gears and LSD lasted 58000 miles
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Old 03-26-2019, 07:49 PM   #19
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Just curious but what's the lifespan of one with just highway miles?


My 2008 lasted 180,000klm before the spider gears started to chip.


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Old 04-17-2019, 02:00 PM   #20
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I too do mostly highway miles, how do you know if your LSD is going or gone?
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Old 04-18-2019, 10:15 PM   #21
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mine made a clunk noise on take off.

I am dropping my jeep off next week for 4.56 Motive gears and a Powertrax grip pro (detriot trutrac clone)
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Old 04-18-2019, 11:40 PM   #22
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If it makes you feel any better the rear locker on my 14 Rubicon was toast at 80k miles with likely little offroad use before I owned it. Hard locked the first time I took it off road. (I tested it in the dirt before I bought it) thankfully it was discovered 5 weeks before my warranty expired. (And thanks to this forum for pointing out I might still be covered)
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Old 04-19-2019, 09:17 AM   #23
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clutch pack style lockers are designed to only last 50-60k by nature of the clutch packs. ford uses the same style in mustangs and a buddy of mine who is a ford tech said they rebuild them all the time. around that mileage. sometimes you will have some last a bit longer or a bit shorter. The clutch packs are very very thin.

I cant wait to test out the torsion style LSD i have on the way
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Old 04-21-2019, 12:03 PM   #24
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Curious...what are the symptoms that the LSD is about to go? I have a 2015 Willys with 18K miles and interested to learn what to look/hear out for...
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Old 09-26-2019, 09:55 AM   #25
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OK, sorry to revive this thread but it is happening to me now. I am trying to get my dealer which is VERY mod friendly to replace the clutch packs under my lifetime warranty and re-gear at the same time so I will save around 50% on labor!!!!!!

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