there it no such thing as balancing a square drive line. if you make one for the front it will be strong/cheap/simple but will make some noise. as far as wanting something for the rear that's bulletproof...schedule 40 3" tube, it cant be balanced 100% but if you are careful and know what your doing when you make one, it should be balanced enough to run at high speed without much vibration. it will be about 30$ worth of material for the rear and i think around 45$ for the front material (if you make the front out of receiver tube).
