OK..I'm starting to look at gears but i dont know which ones i would need. which of these http://mustangtuning.com/rearend.html would be the best for my 1999 Automatic V6? I heard 3.73s a while ago but then someone said that 4.10s are better for autos. It is a daily driver and gas mileage is also important. If I got one of those would I also need one of the bearing kits or installation kits or speed calibrator? Or there are these kits http://mustangtuning.com/mustang-gear-kits.html. Of everything on those two links which is best for my car? If you know of a better setup then let me know. And if anyone knows where i can find a t-lok cuz i want them installed at the same time so i dont have to pay as much install. And what kind of shops install them? I've called dealers and they all say they wont install them for some reason. Sorry for so many questions but I've just been wanting these for a long time and I want to get the right thing. Thanks a lot in advance!