I got out on the track and this truck is amazing. One thing I didn't like was changing the pinion. My Novak 550 is a tight fit and when changing pinions there was no way to do this with the motor in the chassis. I had to remove the entire rear section to install a different pinion. And I noticed that anything larger than a 14T pinion won't fit thru the hole in the motor mount plate and will have to be installed from there opposite side requiring a lot of disassembly. Anybody have some tips for changing pinions?