It's my intrepretation that the TR6060 has different specs for not only gear ratios but internal part strength. I was told that this was done to keep the cost down on the TR6060 (M10) used for the SS validated to 430 ft/lbs as opposed to the one used on the much higher hp and expensive CTS-V MG9 validated to 560 ft/lbs and ZR1 MH3 validated up to 650 ft/lbs
I'd be interested in hearing what the Tremec guys say about the internal trans parts of the TR6060 used in different vehicles. Now talking about output shaft failures on the 2010 SS.
http://media.gm.com/us/powertrain/en..._MG9_M10_n.doc