The gears would make you seriously JUMP off the line with the SC and short tires - yes you would be quicker but your mileage will suffer as the engine will always be in a higher rpm range with these gears. On the highway, it might be a bit annoying - try driving 80 and putting it into 3rd to simulate the noise.
I can't believe no one is jumping on these for their lifted, big tired rigs - this is the way to build an offroad VX right. And if you have these and the SC, you're gonna be better all the way around.