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WTB: 3.9 R160 rear diff

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Old 04-19-2016, 09:03 PM
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WTB: 3.9 R160 rear diff

Need a stock 3.9 R160 rear diff, complete and still intact... not parts/components.

Has to be 3.9 to match my 05 STI 6spd. Was using a 2001 Legacy L rear diff up until today when it grenaded on me.

Looking for something ASAP so I can take it in for a rebuild with a Cusco 1.5 way lsd.

Thanks!
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Old 04-20-2016, 12:53 AM
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I have 2 diffs for sale, from 2004 and 2005 WRX.
50 bucks.
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Old 04-20-2016, 05:06 PM
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Thanks man wish I could use one of those.

For anyone checking this out:

02-05 WRX (MT) has a transmission final drive of 3.9 but a 1.1:1 center diff ratio and a rear diff ratio of 3.545

Meaning the rear end would still be a mismatch for a 05 USDM STI 6spd that has a 1.0:1 center diff.

My best be I'm hoping for is an Impreza L (MT) or Legacy L (MT) rear diff.
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Old 04-20-2016, 08:17 PM
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I honestly thought using the 2L wrx rear diffs for a 6 speed swap was the norm...
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Old 04-21-2016, 08:51 AM
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From all my research I've done it appears they are a direct match for the 06/07 STI 6 speeds because the 06/07 has a 1.1:1 center diff ratio just like the WRX.

04/05 STI 6 speeds have a 1.0:1 center diff so bolting up a 3.545 rear end from a WRX won't match up without changing the R&P.
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Old 04-21-2016, 08:56 AM
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Also as an update, going to hold off on buying another R160 atm.

Pulled my Legacy L rear diff apart yesterday and the R&P still looked in great shape despite there being metal filings all over the magnetic drain plug. I suspect something is wrong or damaged on my Cusco 1.5 way lsd. Just going to take all the components into a specialist to get them inspected and go from there.
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Old 04-22-2016, 11:45 AM
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If you end up needing one I have one that I was using with my 04 six speed swap before going to R180.
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Old 04-22-2016, 11:52 AM
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^ Yea man if you could hold onto that for me that would be great! I can send you a pm as soon as I find out if mine is useable or not.
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Old 04-22-2016, 12:08 PM
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Sure. Just collecting dust right now. Lol

Just hit me up if you end up needing it.
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Old 04-22-2016, 05:02 PM
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Will do, thanks!
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Old 05-02-2016, 11:08 AM
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Sent you a pm k-dogg
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Old 09-28-2022, 10:47 PM
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Bump!

Back to looking for another 3.9 R160.

I need a donor to go with my brand new Cusco 1.5 way (finally got another one!)
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