Ran mine twice now, had a few issues the first time, diff coming loose, slipper backing off... Diff issue was solved by removing the rubber oring at the head end, the slipper issue was solved with a nylon nut as mentioned above...
Have to say I really like this car, and that's straight out of the box! 35 oil front and 27.5 rear were my only changes!
Future things, try a brass bulkhead and the alloy steering arms
