yea if you want to still be able to cruise on the highway at 80 or 90 i would not get 4.10s. I also think your mph is a little off. I still have the stock gears in my 91 gt and im doing 80 at 2000rpm. I would go with 3.73's they seem to be the pefect gear. Cruising at 75-80 you will be...