I briefly started running one of my brushless GB-01 Fox buggies again last summer without pushing it too hard on lighter tires but the driveline started acting up, same behavior as I had prior to previously melting-down a diff. Frustrating as I really enjoyed this buggy. If a better diff was available I would still be running this r/c.
I retired it and replaced it with a Losi Mini 8ight. Pulled the electonics to use the ESC and receiver in the Mini 8ight. It's in my living room now for display...also let the toddlers roll it around. I still have one or two spare diffs so there is the possibility for it to be recommissioned with a brushed motor..stock or the Tamiya upgrade so the kids can run it when they can properly hold and operate a transmitter...but then there are a lot more options out there now that may be a better and more supportable r/c for that purpose, so perhaps mine won't see a return to service.