I have for sale a brand new 3.91 Performance gear Kit straight out of the GM performance catalog. I bought the kit about 3 months ago but never had it installed because I decided to go a different route with my vehicle. This kit work with all V8 5th gens 2010+ auto and manual. I paid 550 for them shipped. Open to reasonable offers that don't leave too big of a hole in my wallet. Also I have a stock ls3 90mm throttle body and stock intake with k and n drop in filter. Open to all offers. Thanks. Also Kit was never taken out of the box.