I posted this question on another thread but maybe several had already been there and I wanted to post a new post so that I can get some good feed back. Which by the way I always get great feedback here.

Here is the question: I have a 2007 Mustang GT and an auto car. My car came stock with 3:31 gears but I was thinking of also going to 3:73. The dealer will do it and give a 1 year 12k warranty.
Does any one have any feed back on
1. s197 auto 3:73 gear change and
2. Having the dealer do it?