I finally finished installing my 4.30 gears yesterday., Measured centerline shimmed till it measured correct then installed the gears and shimmed till backlash was within 7 thousandths. I have absolutely no gear wine. Anyways these gears are the best thing I every did. I wish I never would have gotten the 3.73s i had in it. They pull like a train and are still very streetable. At 70 mph i am just a little over 2500. I haven't been able to floor it completely because im still breaking them in but I can still tell a difference. I also have a partially blown transmission so i was taking it a little easy on it as well lol. I just wanted to let everyone to know that they arent nearly as bad as you would think and are just a little over a 100 rpm more that a set of 4.10s. Dont fear the gear!!!!