Ok so heres the question I have and hope you guys can help out. My current set up is a 408 with a s480 turbo and 4l80e tranny. I'm taking it to flaco soon to have it retuned and also have the boost turned up to 20psi. Having said that, should I keep my 3.30 gear that I have now or upgrade to a4.10 or 4.56 gear. I know once I get the boost up things will change but I want to know if I would be running out of gear in the 1/4 mile. The only reason I want to change is because I have a 33" tall tire and it makes my first gear stupid long. I took it to the 1/8 mile and it ran a 8.2@88mph. On the first pass I didnt get out of 1st gear until I was 50ft from the finish line and on my last pass I stayed in 1st all the way down the track. LOL!! Heres a vid. You can hear it go into second damn near the end of the track. What do you guys think?? vicalma03 first pass - YouTube

 

i think turbo guys like 3.43-3.55 gears with 28-30inch tires but with 33s thats a big tire might get away with 3.73-4.10