RC Truck need more speed

I have a old Traxxas Stampede. I just modified my ESC to a Casle mamba pro. I upgraded the Motor to a Castle 1406 6900 MVA motor. I am running a 24t pinion and a 84t Spur gear. I have run the unit and it is not fast enuff. I want to change the rear ratio and not shore with gear to change and witch way to go with it. Can any one help?

this is a plastic model forum

go to RCtech.com, they can help you over there.

Up the battery size, and start with going a couple teeth bigger on the pinion.

Thanks. Sorry if I am in the wrong forum. I found other post. But again thanks for the info