Building my first Kart for my boys. Motor is a Predator 6.5 (non-hemi), 1" rear axle, 19" tires from a riding lawnmower, haven't purchased my torque converter yet, the one I was looking at was a 12 tooth #40. I have mechanical brakes, 60t #40 rear sprocket. The frame is built from 1" O.D. square...