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Does anyone know: does the Getrag diff need to be out of a CTS-V? Or can it be from a normal CTS?

I'm looking at this one:
http://cgi.ebay.com/ebaymotors/ws/eB...fvi%3D1&_rdc=1

They say they are NEW overstock and they are selling them cheap. They also said it was a limited slip unit but I am trying to get the part # from them to double check (if I can).

Also, I thought I read that the LSD units are a 3.73 gear ratio. This one is listed as 3.23 and on V8Rs site they say:

"We utilize Getrag in our road course and street cars. When sourcing the Getrag look for the 2008 and later models for the latest casting and seal updates. G80 series limited slip GM part numbers:
3:23 - 25978162
3:42 - 25873500
3:23 - 25978162"

Can I use this one that I've linked to on ebay and possibly add 3.73 gearing later (where would I get the gears?)?

Thanks in advance, I'm trying to get the main parts of the build first. I've got engine/tranny/clutch/subframe so far.

-Jessica


edit: I didn't see all the pics down below..

gmpartsdirect.com lists the part number "15793713" as being superceded by "25978161". However, this 259 number is listed as a NON positraction/limited slip differential, and says nothing about being for a CTS.

But if you use the alternate catalog gmpartsdirect.com supplies, the part number "25978162" V8R supplies is also listed for a SRX/STS.

And that part # has bunch of listings:

Item Number MSRP Price
25978162 $973.31 $708.57
Universals & rear axle - Rear axle - Differential - Carrier
Carrier, srx, 3.6l, w/o rear positraction, 3.23 ratio, rwd 2009

25978162 $973.31 $708.57
Universals & rear axle - Rear axle - Differential - Carrier
Carrier, srx, 3.6l, w/rear positraction 2007 - 2008

25978162 $973.31 $708.57
Universals & rear axle - Rear axle - Differential - Carrier
Carrier, srx, 4.6l, w/rear positraction, awd 2009

25978162 $973.31 $708.57
Universals & rear axle - Rear axle - Differential - Carrier
Carrier, sts, sts-v, 3.6l, w/limited slip 2008 - 2010

25978162 $973.31 $708.57
Universals & rear axle - Rear axle - Differential - Carrier
Carrier, sts, sts-v, 4.6l, w/o awd, w/limited slip, 3.23 ratio 2005 - 2007


Maybe someone can enlighten me as to how the same GM part # is listed as a limited slip, and non limited slip?

Will an SRX/STS diff work or are they different?

All I'd like to run is a new[er] style diff that won't break, with an LSD, and preferably 3.73 gearing.