Dog Shifting Gearbox Feedback

[SerpentEagle]

I've recently designed my first 2-speed shifting gearbox (technically 2nd, but the 1st one was abandoned half way through). I learned how to design these completely just by examining models made by other teams, so please point out any mistakes that I have made.



Theoretical robot speed with 2 gearboxes, 4 in wheels, and 120 lbs load: 6 fps & 15 fps

Weight (according to Solidworks): 10.8 lbs

Right now I have #35 12t sprockets on this for a west coast or similar style drive. Is a larger size recommended? If so, why?

Model files: https://grabcad.com/library/shiftbox-2-1