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flyer08 · 06-23-2016, 08:55 PM

Just installed 3.91s (although a 2010 but is the same).

1) you can install in your current differential
2) can't answer as I didn't go to GM dealer. I used hptuners
3) from what I read it should be covered in warranty if GM dealer does install

06-23-2016, 08:55 PM	#2
flyer08 Account Suspended Drives: 2010 2SS/RS Join Date: Jun 2009 Location: Texas Posts: 3,418	Just installed 3.91s (although a 2010 but is the same). 1) you can install in your current differential 2) can't answer as I didn't go to GM dealer. I used hptuners 3) from what I read it should be covered in warranty if GM dealer does install