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Old 06-29-2013, 01:32 AM   #1
thill02
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Member#: 360879
Join Date: Jun 2013
Default Which Subaru has which Center/Rear diff type

I'm wondering if anyone know where I can find detailed model year specs on which subaru's have which center and rear diffs.

Trying via process of elimination to determine if it is just a LSD that causes cars like the Subaru 2.5 RS '01 to not do well in the snow when compared to a '07 legacy.
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Old 06-29-2013, 09:37 AM   #2
FuJi K
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Join Date: Jan 2001
Chapter/Region: MWSOC
Location: St. Paul, MN
Vehicle:
MY99 GF4 JDM 6spd
NF Performance

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In what ways is the '07 Legacy better than the '01 2.5RS?
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Old 06-29-2013, 02:07 PM   #3
silverton
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Location: Burien, WA
Vehicle:
2001 2.5RS
STM

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I've read contradicting information, but afaik MY00-01 GC-RS's have a R-LSD, I've also read that only the MY01 got a R-LSD. I know for certain my MY01 does have one. As far as center's, the GC got the short end of the stick in the US, the GC with MT is considered a "continuous" AWD system which incorporates a viscous type differential and is essentially 50/50 power split all the time. The GC with AT is considered an "active" AWD which under normal driving conditions and freeway speeds is set to a 90/10 torque split, and can change all the way up to 50/50 split depending on wheel slippage, and this happens very quickly! But both transmissions have an open front differential.
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Old 06-29-2013, 05:59 PM   #4
mhoerath
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Chapter/Region: MAIC
Location: richmond, va
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2003 354 ftlb@3k rpm
justablue hatch

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go to post 1 of thread for rallitek's trans decoder sheet.
http://forums.nasioc.com/forums/show....php?t=2173258
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Old 06-29-2013, 11:59 PM   #5
thill02
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Talking

Thanks a bunch this sheet is just what I needed!
Although the 08 legacy is incomplete on the rear diff I think it's supposed to be open not blank. Also the line US Impreza RS MY99-01 / Legacy GT MY99 says open/viscous pretty sure viscous means limited slip right?


And I posted in another thread about the 01RS: it might have been the limited slip rear diff, a problem with the center diff not transferring power front to rear, or just bad tire choice on my part that it did poorly in the snow conditions here where I live.

Unfortunately I no longer own the car so I've no way to be sure, but for now I'm going to stay away from limited slip rear diffs on manual trans for the snow driving I have to do just in case since every Subaru that my family/neighbors own has an open rear diff according to this chart and does fine.

Last edited by thill02; 06-29-2013 at 11:59 PM. Reason: line spacing
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