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Old 06-05-2013, 09:48 PM   #11

VADER SS L99's Avatar
Drives: 2013 A6 GT 5.0
Join Date: Nov 2009
Location: Edmond, OK
Posts: 2,909
Only do the 3.91's if you are cammed or have a triple disk aftermarket converter. Otherwise do like others said and get the 3.70's. I dont consider wheel spin from 3.91 gears to be the biggest issue as you could always use bigger and stickier tires. Its the fact that it forces a shift into 5th too soon if you dont have a cam with a higher redline or triple disk converter that can be locked up at WOT.
BLK/BLK 1SS/RS Ordered 11-01-2009 Took delivery 12-22-2009. Heads/cam/converter/bolt ons. SOLD Feb 2015 to fund 6th gen LT1 SS with 8L90E.
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