like others have said send an email, I had a problem with my 1/18 and sent them an email asking what could be done to fix it, they sent me one back saying that a new truck was in the mail, recieved it one week later :thumb:
I actually got through by phone and they were very nice. He told me I would need a new front axle housing and a set of steering nuckles and they would be at my door in about a week. That was about a week ago so I should get them in the mail soon. Although I won't need them since Wal-Mart took my broken one back and gave me a new one, I guess I'll have a few spare parts now.