I will be getting a 9" pretty soon here, and want to figure out what gears to get. The mill pushing all of this will be the following:

LE2 heads/cam 383 LT1 with a single stage 250 shot for fun.

It is a 6 speed car, and it will get a Street Twin this winter, and also a Denny's Nitrous Ready driveshaft.

I like the 4.33 gears because with a 26" tire it would do well for 7krpm through the traps while NA, and a 28" tire on the juice. I don't think the 4.56s would let me stay in 4th on the juice with the 28" tire.

28" tire 7000rpm
4.33.......................134.6mph
4.56.......................127.9mph

26" tire 7000rpm
4.33.......................125.0mph
4.56.......................118.7mph

25.66" tire (stock 275/40/17) 7000rpm
4.33.......................123.4mph
4.56.......................117.2mph

Does that seem reasonable? All of the suspension goodies will be in place for a solid launch, and I know the engine will make power as high as 7k for running it out in 4th.

If you haven't figured it out by now, I could care less about gas mileage, but with the 6 speed, it will do rediculously well for what it is, but thats really a moot point.

 

Lol, nice sig I think you answered you own question there, on the juice u would prolly have to shift into 5th, go with the 4.33's