Not intending to hijack the VSS thread.
If everything else is the same then, higher numerical ratio is weaker than lower numerical ratio gears. Would be interesting to know how they get "50% stronger than stock" with 4.75 gears. That MAY be true. But when I do engineering work before buying or making parts, I use exact data to make my decisions. 25% stronger or 50% stronger is obviously not useful info.
The reason why I posted the comment about breaking gears is because that is what is going to happen if the gear you use(to correct your speedo) is not as strong as the gears you replaced.
I might be interested in 4.75 gears myself if they were stronger than the 4.11s.
Randall