tomsws6

iTrader: (2)

ok, when i bought my car it had 18in C6Z wheels on it with 285/35/18 on thye rear with 3.73 gears. I have since installed 305/35/18 MT DR. Iv done some calculating and it seems that my gear ratio has gone done from 373 to 3.65. Will this cause any issues with the speedo, performance? I cant get into 6th gear until 70ish now that iv got these tires on. Iv also installed LT's too. I just wonder with my small amount of mods(mild 355, P/P heads intake and lt4 hotcam and 373) if the motor isnt running right because of the gear ratio change? before the LT and MT i could go into 6th around 50ish with no issues.

ChevyChad

iTrader: (50)

Well, your speedometer will definitely be off a bit due to the taller tire I can tell you that much.