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Old 02-13-2017, 03:02 PM   #1
AkotaHsky
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Default 2015 WRX - Rear Differential

I went to do my 30k service and replace the transmission and rear differential fluid.. When I took out my drain plug for the rear differential, it was all kinds of fun.




I cleaned it off and reached into the whole with a finger and found some more lovely chunks.. All in all, this came out of the rear differential.






I am going to see if this is something I can get covered under warranty, but I am expecting them to say no since I have quite a few performance modifications under the hood. The weird part is that I had no idea my rear diff was this bad off. I have heard no noises or had any kind of issues with it..

Has anyone else experienced something similar or replaced there's? I know some people have done an LSD swap, but not sure I want to go that route. Are there specific models with the same kind of Open Diff I can just swap in?
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Old 02-13-2017, 03:30 PM   #2
Coleman84
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that does not look like normal wear.... good luck
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Old 02-13-2017, 03:53 PM   #3
downsouthman1
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Quote:
Originally Posted by AkotaHsky View Post
I went to do my 30k service and replace the transmission and rear differential fluid.. When I took out my drain plug for the rear differential, it was all kinds of fun.




I cleaned it off and reached into the whole with a finger and found some more lovely chunks.. All in all, this came out of the rear differential.





I am going to see if this is something I can get covered under warranty, but I am expecting them to say no since I have quite a few performance modifications under the hood. The weird part is that I had no idea my rear diff was this bad off. I have heard no noises or had any kind of issues with it..

Has anyone else experienced something similar or replaced there's? I know some people have done an LSD swap, but not sure I want to go that route. Are there specific models with the same kind of Open Diff I can just swap in?
If you're gonna swap your diff, may as well run an LSD. I wonder what that material is exactly that you found.
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Old 02-13-2017, 05:48 PM   #4
Boggie1688
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http://m.ebay.com/itm/332124380755?_mwBanner=1&ul_ref=http%253A%252F%252 Frover.ebay.com%252Frover%252F0%252Fe11051.m43.l11 23%252F7%253Feuid%253Dd83e20d12ac8410fbf17ef1b86ba b426%2526bu%253D43033678917%2526loc%253Dhttp%25253 A%25252F%25252Fwww.ebay.com%25252Fulk%25252Fitm%25 252F332124380755%2526sojTags%253Dbu%253Dbu%2526src rot%253De11051.m43.l1123%2526rvr_id%253D0&ul_noapp =true

250 obo on eBay.


There is also one on Craigslist in the northwest asking 200.
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Old 02-13-2017, 09:21 PM   #5
drewvdw
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That's assuming it isn't the ring and pinion...however, if it was, I would think you would hear or notice it. Definitely check it over though.
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Old 02-14-2017, 10:28 AM   #6
AkotaHsky
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Quote:
Originally Posted by Boggie1688 View Post

250 obo on eBay.


There is also one on Craigslist in the northwest asking 200.
Is that yours or just a quick search you did? I was looking at full rear diff replacement, but this may be better provided there is nothing crazy I need to do to replace it besides undo some bolts and put it back in. I was reading elsewhere of people having to "shim" or something along those lines.

If the dealer doesn't want to warranty it, this might be the best route.
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Old 02-14-2017, 10:30 AM   #7
AkotaHsky
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Quote:
Originally Posted by downsouthman1 View Post
If you're gonna swap your diff, may as well run an LSD. I wonder what that material is exactly that you found.
Someone mentioned that it may be the spider gears. I was looking at the Cusco LSD, but that is going to be close to $1500 for it. Used rear diffs run about $650 on eBay or I could do like some have done and get a different VLSD and swap it in from an older Subaru.
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Old 02-14-2017, 11:46 AM   #8
Trae32566
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Here's a pretty good option, and the thread (along with the list of Subaru Differentials floating around here somewhere) has some of the model years that fit. You might want to consider going to a scrap yard and pulling one if you can find the right vehicle:
https://forums.nasioc.com/forums/sho....php?t=2758273
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Old 02-14-2017, 12:50 PM   #9
Boggie1688
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Quote:
Originally Posted by AkotaHsky View Post
Is that yours or just a quick search you did? I was looking at full rear diff replacement, but this may be better provided there is nothing crazy I need to do to replace it besides undo some bolts and put it back in. I was reading elsewhere of people having to "shim" or something along those lines.

If the dealer doesn't want to warranty it, this might be the best route.
Not mine, just looking at R160 diffs lately.

Here is the challenge with EITHER route; replacing the whole diff or just the internal pumpkin.

The 2015 WRX has a 4.11 R160 diff. If you don't buy a 4.11 R160, you'll end up needing to replace the ring/pinion gear to make sure you get 4.11 as your final drive ratio. If you don't, your rate of acceleration will change and your speedo will be in correct.

Next you gotta make sure the axles fit this new diff. Unfortunately subaru changed axles a lot, meaning spline count and diameter are different from some years to others.

The ideal situation here is to get a 4.11 out of a 2015+ WRX. Everything will bolt up and you don't have to shim or check backlash.

If you have time and are handy, rebuilding it yourself might save you some cash. However, you don't know the extent of the damage without tearing it apart first.
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Old 02-14-2017, 01:34 PM   #10
BoxerfanVaFa
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I was looking into the Kaaz unit myself. It lists for around 850 any says it's compatible with the r160. I have a 2017 wrx btw.
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Old 02-14-2017, 02:32 PM   #11
AkotaHsky
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Quote:
Originally Posted by Trae32566 View Post
Here's a pretty good option, and the thread (along with the list of Subaru Differentials floating around here somewhere) has some of the model years that fit. You might want to consider going to a scrap yard and pulling one if you can find the right vehicle:
https://forums.nasioc.com/forums/sho....php?t=2758273
I've read that entire thread a few times and reached out to the OP already. I got a pretty good plan if this thing doesn't pan out with the dealer. Hell even if the dealer does replace it, I might swap it.

I think you are right though.. Scrap yard will be best.
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Old 02-14-2017, 02:35 PM   #12
AkotaHsky
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Quote:
Originally Posted by Boggie1688 View Post
Not mine, just looking at R160 diffs lately.

Here is the challenge with EITHER route; replacing the whole diff or just the internal pumpkin.

The 2015 WRX has a 4.11 R160 diff. If you don't buy a 4.11 R160, you'll end up needing to replace the ring/pinion gear to make sure you get 4.11 as your final drive ratio. If you don't, your rate of acceleration will change and your speedo will be in correct.

Next you gotta make sure the axles fit this new diff. Unfortunately subaru changed axles a lot, meaning spline count and diameter are different from some years to others.

The ideal situation here is to get a 4.11 out of a 2015+ WRX. Everything will bolt up and you don't have to shim or check backlash.

If you have time and are handy, rebuilding it yourself might save you some cash. However, you don't know the extent of the damage without tearing it apart first.

The other ones I have been looking at are 4.11 R160 VLSD swaps from like a Forester XT, Legacy GT, or BAJA. I agree that my best option is to likely stick with what the car came with. The ones I just mentioned all use the same type of axles and looks like some people have been able to pick them up for about $100 or less.

I definitely do not feel comfortable rebuilding it myself to be honest. I have no problem swapping the differential out, but it would suck to rebuild and it be of and then just eat itself again.
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Old 02-14-2017, 03:20 PM   #13
Boggie1688
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Quote:
Originally Posted by AkotaHsky View Post
The other ones I have been looking at are 4.11 R160 VLSD swaps from like a Forester XT, Legacy GT, or BAJA. I agree that my best option is to likely stick with what the car came with. The ones I just mentioned all use the same type of axles and looks like some people have been able to pick them up for about $100 or less.

I definitely do not feel comfortable rebuilding it myself to be honest. I have no problem swapping the differential out, but it would suck to rebuild and it be of and then just eat itself again.
There is a reason why VLSDs can be had for so cheap. VLSD tend to fail over time and begin to act as an open diff. More than likely, you'll be getting a VLSD that is an open diff. Still cheaper than a unit for a 2015+ WRX.
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Old 02-14-2017, 03:54 PM   #14
downsouthman1
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Quote:
Originally Posted by Boggie1688 View Post
There is a reason why VLSDs can be had for so cheap. VLSD tend to fail over time and begin to act as an open diff. More than likely, you'll be getting a VLSD that is an open diff. Still cheaper than a unit for a 2015+ WRX.
Why is the 2015+ so expensive when all it is is an open diff?
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Old 02-14-2017, 05:04 PM   #15
AkotaHsky
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Quote:
Originally Posted by downsouthman1 View Post
Why is the 2015+ so expensive when all it is is an open diff?
Most likely since its still a newer car and less availability of ones that have been totaled out and made it to junk yards.
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