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Old 09-10-2008, 05:07 PM   #1
smileyou
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2003 PIA wrx
wrb..future ppg/fggreen

Default 3.90 r160 users chime in

I can't seem to locate a 3.90 ring and pinion . Where did you get yours and how much did it cost + installation
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Old 09-11-2008, 09:09 PM   #2
Legacy777
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AWD 6MT EJ22T AWIC Swap

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the 91-94 turbo legacies AT & MT, 92-94 non-turbo legacy AT had a 3.9 final drive ratio and would have the a 3.9 rear diff. There's a few imprezas too that have a 3.9 final drive ratio as well.
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Old 09-12-2008, 01:57 PM   #3
MrPhiscal
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www.subaruparts.com
part # 38104AA010 526 plus shipping . Or try local with the part number
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Old 09-12-2008, 02:14 PM   #4
swiftwrx06
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If your interested i have a 3.9 r160 lsd that was rebuilt after coming off an older legacy. I had it on my car for less than 10k miles before i swapped in the r180/brembos.
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Old 09-12-2008, 06:53 PM   #5
smileyou
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Quote:
Originally Posted by swiftwrx06 View Post
If your interested i have a 3.9 r160 lsd that was rebuilt after coming off an older legacy. I had it on my car for less than 10k miles before i swapped in the r180/brembos.
Now that's what I wanted to her =) sent pm. Let me know what you guys got
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Old 09-13-2008, 08:27 PM   #6
swiftwrx06
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pm replied to
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Old 09-14-2008, 10:47 AM   #7
Dubstar112
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i bought my 3.90 from ds1 motorsports. installed myself with some cryofitting
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Old 09-14-2008, 01:49 PM   #8
smileyou
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Quote:
Originally Posted by Dubstar112 View Post
i bought my 3.90 from ds1 motorsports. installed myself with some cryofitting
What did you buy. The ring and pinion on the whole 3.9 diff???
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Old 09-14-2008, 04:31 PM   #9
Spiider
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I'd assume when he mentions cryo fitting, he is talking about installing the 3.90 ring onto his diff.

You can "home cryo fit" by putting the ring on a hot plate and the diff in the freezer. The thermal expansion coefficient of steel is ~11-12ppm/Degree C.

So if the ring was say 150 degrees and the diff was 0, you could get a substantial enough size difference to be able to slip fit it instead of pressing it on.

Just don't fool around too long getting the orientation correct or it will be stuck.
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