Originally Posted by snellemin

If voltage increases than motor current consumption decreases, when gearing stays the same. With a decrease of current, there is less motor torque. But you won't see the difference driving around as motor horsepower has increased a bit. If want the same amount of torque at the wheels while keeping the increase in horsepower, you need to drop a couple teeth on your pinion. Your car will be snappier of the line and have about the same topspeed.

Why not just loosen up the clutch to reduce stress on your drivetrain?