Here are to sites that are full of information. I don't know how accurate the first on is. It's from April 2008. The second on lists all the specs for both the SS and the V6 models at the end. I think the answer to your question is at the end of the 2nd article listed under "Final Drive". Which lists the V6, both auto and manual as 3.27. The V8 auto is also 3.27 and the V8 manual is 3.45. I have a V8 manual and know it is 3.45. The rest I can't confirm.
http://www.cpgnation.com/forum/offic...eased-911.html
http://green.autoblog.com/2009/03/16...-highway-rati/