[TerryS]

Last year's AM14U mecanum upgrade kit will not work on this year's AM14U2 without modification to the inner plate. You would have to drill your own mounting holes for the Toughbox Nano gearboxes and cut away part of the flanges to make clearance for the gearboxes and wheels. On the Andy Mark You Tube channel Andy says that both 4" and 6" upgrade kits will be available soon, couple days for the 4" and maybe next week for the 6".
https://www.youtube.com/watch?v=7Bum0ImD46k

I like to hear what teams that used the upgrade kit on last year's chassis thought about its performance.