I don't know very much about rear end work. I know that my 2010 R/T auto has 3:06 gears and does not have limited slip diff. I'd like my R/T to pull a little better on the street. I don't plan on using it at the track. A friend of mine suggested that I take it to the dealer and have them install lower gears such as 3:55s. Could I have just the gears installed and if so what kind of performance change should I expect? I'd appreciate any opinions on this.