I have a HPI Savage... well my dad does anyhow. He quit using it about 3-4 years ago and its been sitting in the garage ever since. I'm 16 now and i thought it would be cool to start messin with it. Before my dad put it away he tried to put a reverse modual on it, and when i took it down from the shelf, it sounds like something is grinding when you push it forwards but is fine when you push it backwards. Have not tried to start it incase that could screw with something. I'd really appreciate it if someone could help me out, Thanks 🙂