Congrats on the SMT, I did the same on the last sale. Built initially with 2.6 clod tires it was a disaster. All kinds of driveline issues, even with all the usual hop ups on the axles. I've stepped down to a set of 2.2 destroyers for a while now... great tires, and far less stress on the drivetrain. A bit small, but not too bad. AR60's were just never designed for huge 2.6 tires imo, they just don't handle them well. Very happy I dropped down to 2.2's, I haven't had a failure since. 2200kv 550 on 3S all day long. Not sure they even make these tires anymore...
old, very clean pic