love them. Go with AAM/Lingenfelter...my dealer does aftermarket stuff as well...they sold me the gears and did the install. Its awesome...like stock quiet. Honestly, the gain from the gears is huge going from 3.27 to 3.70.
2014 GMC CC Z71, 2009 C6 vette (672/639 at the wheel and less than 3300lbs)
2010 Camaro 2ss/rs---SOLD 4/15/14
-654whp with a few cosmetic things, Pfadt suspension, Vortech, CircleD, GPI ss3 vvt bump stick, gears, stuff in between,18" TSW N'rings for drag duty, 20" Forgestar F14s for street.
rhino@ Gwatney Chevrolet/GPI Jacksonville AR
TCAudio in Benton AR