hey, first corvettes are not worth the price, ex. local pizza plus owner in town bought new one with 505hp and i've raced him 4 times, first time had radials and no tune(about 20 miles on engine since built ) stayd by him to 60mph smokin tires,< happened twice, so told him soon as get some traction race again , so buddy bought set od mickem et streets that were 28.5 11.50. threw them on it and raced again and from 40mph roll pulled him a car and half till 90 then he passed me like i setting still(then i found out bought the difference that tire height make to your gear ratio. So i killed the et street and borrowed set of 26'' et streets and raced him at 40mph roll and pulled him 3-4 cars to 110mph then he passed me like i was setting still. I am tickled that i pulled him and stayed in front to 110, he couldn't figure why i was smilling after we raced. But im a 1/4 mile racer, he a wide open race type, i've had my range topped at 145 between 6500 and 7000 rpm(really dont know exactly trying to watch were i was going at this speed, and i didn't care for being that fast in my truck.(i tell everyone it like a brick going through the wind,(no aerodynamics at all) .far as gears depend on what u use ya truck for how far u drive it? interstate? mine is c4 with 373 and 60mph is 3000 exactly with 26'' tall tires,Interstate is tolerable barely,3'' flowmasters cut at rearend is loud when u hear it for an hour or two, a 4speed would be close to the same as this a four speed 2nd gear is first in a c4, if u run a 5 speed u can handle 4:10 , I'm swapping my c4 this winter for a tko and some 4:10s i will have a streetfire.net video up in a few of my ranger burning the slicks off. thanks for reading