i have 4.10 gears in my 2003 gt. i also have a new odometer that fits over the old one but the only diff is that it is blue and white. i have my diablo set up for the 4.09 because it does not give the option for 4.10s. but i was going down i75 and i did a top speed run and i was going 145mph and the needle jumped up to 130mph and then went back to i guess the right speed at 150 and then berried to the little black stopper and right when it hit the needle immediately jumped backwards to 0mph. wtf happen