Hey guys I have a 48 Chevy fleetline with a 350/350 combo in it, I have a 8.5" 10 bolt in the back with 2.56's open drive. I'm running a 28.88" Tire on the back At 70mph i'm doing 2000rpm....I took it up to about 3500rpm the other day on a long stretch of road and i'm pushing 120mph. In reality my car will do 170mph doing 5000rpm. Only problem is with it geared like this is that it's slow off the line. I was thinking about changing to 3.42's. Was wondering if any of you guys have made that big a jump and what's it feel like? Any opinions would be greatly appreciated. I couldn't give a shit about gas mileage so i'm not worried about the mpg it's not an everyday driver it's after work and weekend car.