With a 26" tire, in 4th gear, at 6,200 rpm, you will be at 118mph with a 4.10 gear.
With a 26" tire, in 4th gear, at 6,200 rpm, you will be at 112mph with a 4.30 gear.
If you plan on staying N/A for a while, and just doing usual bolt on's. You will be fine with a 4.30 gear. If you plan on...