Thanks for all the posts everyone, especially MUSTANGO2GT if it wasn't for your post about what mph you were running in those gears I would've just assumed that I had the 3.55's and bought 4.10's and then not been too impressed with the gain and been a tad depressed! lol learned a lot from all the posts and helped to make my decicion on what to do next as well.....thanks again to all you WICKED STANGS