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Old 06-07-2008, 04:13 PM   #1
renew
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wr blue mica

Default 06/07 - better rear diff (LSD)

Hi guys, I am quite new to NASIOC but I have the following question (didn't find any real answer during my research I did for a few days right now )

I have a 06/07 (actually its a MY06) WRX and I want a better rear-differential for normal driving on the road but the car will also be used on track-days.

Are there any changes between the 2.0 WRXs and 2.5s? Same differential housing? I know that the final drive is different - but does this affect the choice of available LSDs? Where and how is the drive train attached to the diff (actually determining the final drive ratio)

Actually I would prefer a mechanical type like a quaife - but Quaife said there diffs only fit the "old" ones till MY00.

So has anybody done a rear-diff-swap to something more affective than the stock unit without having to change the axles and anything else?

Thank you very much, yours renew
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Old 06-07-2008, 08:46 PM   #2
jaxscuby
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you can upgrade rear diff to aftermarket lsd
with no problems.

just make sure it is the proper lsd for your car's year.
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Old 06-07-2008, 11:10 PM   #3
aboothman
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The Ring and Pinion Gear Ratio is different by year, but you can remove the Ring gear from the differential unit, and then bolt it on to your new diff and put it back together. Ensure it is shimmed properly, of course

I am not sure about axle differences between years.

Last edited by aboothman; 06-08-2008 at 01:00 PM. Reason: added "R&P Gear Ratio is different"
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Old 06-08-2008, 01:46 AM   #4
Unabomber
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All WRX/RS rear diffs are the same, so you need aftermarket. Go read the Differential FAQ for your options.
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Old 06-08-2008, 07:53 AM   #5
renew
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Quote:
Originally Posted by Unabomber View Post
All WRX/RS rear diffs are the same, so you need aftermarket. Go read the Differential FAQ for your options.
thats what I heard but wasn't sure about.

So if the Diff fits for instance a MY00 RS (like Quaife says there diff does) it would also fit into my MY06 WRX.

So thanks, I just wanted to be sure. And of course I've read the diff-FAQ, but haven't found any thread about just replacing the rear-diff of a MY06/07.
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Old 06-08-2008, 12:11 PM   #6
FuJi K
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A clutch Type LSD for the rear is ALWAYS more favorable. Yours is R160 still, and LSDs made for the WRX will fit any of the newer R160s; '97+ 2.2L Impreza, '95+ Legacy/2.5GT/Outback, '97+ Forester.

For the OLD SKOOL guys; 93-96
There is a different rear diff on the 1.8L Impreza L, you'd have to swap that with the newer R160. The '97+ Impreza L's has the R160. Yes, a WRX LSD will fit onto an Impreza L's rear diff as well if the Impreza is within the years and has the right rear diff.
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