RCAWD has a multiple options for 16th scale RC's! go check them out for all kinds of upgrades! they have stuff for axial, arrma, traxxas, mjx and MORE!
Sorry for the late response. Here's a link to the tires I used. rcawd.com/products/1-16-1-18-12mm-hex-pre-glued-nylon-wheel-rubber-tires-v-shaped-tread-gl-0053bl-gl-006bl
I have those same Wheels myself from my version of that RC vehicle and they do do provide some more clearance for that rc Vehicle, where I'm at. But I doubt it. it's 1/16? I believe it's a 1/18. Pertaining to be a 1/16.
Diffs are fine buddy. It was the spur gear going out due to a worn out bearing. The wait time for the parts was 3 weeks, so I just sent it. I had video obligations to fulfill for a channel sponsor. I didn't have the luxury of waiting for the parts.