Mine did the same, on mine it was inside the gearbox. I rebuild the gearbox and pushed the parts as close together that i could and it was fine :)
I built mine as full rc (recomended strongly) but made it bakc to original due to I had to steal parts from 2 other models...
Hi, just signed up for this forum just because of this thread. Trying to rebuild the chassis from the pictures that "jim" posted on page 3. got a little stuck due to the pictures being so far from each other in the build.
Hope you finish this constuction. :)