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Old 09-18-2007, 08:18 PM   #1
triguy
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Member#: 27109
Join Date: Oct 2002
Chapter/Region: SCIC
Location: Carlsbad, CA
Vehicle:
2002 WRX Wagon
2.5L Crawford, 6 spd

Default WRX rear differential conversion to 3.9 R&P

Hey guys:

I just purchased a used 2005 STI transmission for a 2002 WRX wagon and am looking for suggestions on vendors, preferably in California, who would install a 3.9 R&P into the stock rear differential or vendors who sell a rear diff already converted. Suggestions on sources for the 3.9 R&P parts would also be welcomed.
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Old 09-19-2007, 12:27 AM   #2
Storm
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Join Date: Mar 2001
Chapter/Region: MWSOC
Location: SAUL'S Motorsports
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96L Most Over-
Developed Beater

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The easiest way is to buy an OBS rear diff and put your VLSD into it, using the same ring. The procedure is well documented......

Jay Storm
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Old 09-19-2007, 03:36 PM   #3
triguy
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Member#: 27109
Join Date: Oct 2002
Chapter/Region: SCIC
Location: Carlsbad, CA
Vehicle:
2002 WRX Wagon
2.5L Crawford, 6 spd

Default

Thanks pointing me in the right direction. I've been searching all over. The OBS lead yielded this gem. It's a listing of the diff gear ratios for many years of Subies. The 1991-1992 Legacy Turbo had a rear diff with a ratio of 3.9 and a LSD but I'm not certain if the WRX axles will match up to it.

http://wac.addr.com/auto/obs/lsd/lsd.html

Last edited by triguy; 09-19-2007 at 03:42 PM.
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