Assuming you are referring to the new AM14U kitbot, the
VEX 3 CIM Ballshifter, and both WCP
SS &
DS Gearboxes can be added onto the chassis. We created a document
here that goes through a step by step process on how to do this, as well as other upgrades such as wheel and belt swaps. All of the modifications can be done with just a cordless drill. Hopefully this helps you out.