I'm gonna fix my rustler, as then I can get several others running for the price of a new one. However, I can't find anything to say whether it is a pro .15 or a TRX 2.5 and I don't exactly know what to look for on it to tell. I'll get pics of it up soon so someone can help. Maybe say what all is missing? I guess it ran and then the pull starter broke, and that was replaced, but then the engine just siezed, then it was given to me. I tore it apart to see what happened and the connecting rod was destroyed into many pieces. This was like 2 years ago, and now i have found some of the parts for the old engine, but not all.