[EricH]

Originally Posted by Sam2197

thanks for all the help. regardless we are going to prototype a drive system sometime hopefully in the next month. i've read about how they work and everything but i guess i wont be exactly sure until i see it. and what is the best way to attach the wheels to the gearbox and what is the best gearbox to use

Sprocket and chain is the best, though some will prefer direct drive. The best gearbox is a relatively fast one; mecanums don't transfer power in the same way as a 4WD. (Hint: Toughbox, unmodified, is/can be too slow even on a 1:1 ratio to the wheel.)