The whole drivetrain feels tight on mine, I'm going to bung a motor in it and run it on my 4 cell lathe battery for a while to bed everything in. The steering hubs feel quite tight as well, I think I'll have to investigate what's going on here, I think someone else mentioned that as well. I was thinking of sticking a steering servo in it on a servo tester and put it on test mode so it steers back and forth constantly, try to free it up. The only problem is at the moment I only have 1 stock motor which I'll have to steal out of my DF-03 until I can get a new one...
-Steve