JS, a failsave is a little piece of electronics that goes between the receiver and the throttle servo. You set it so that it will return the thottle servo to a predetermined position when radio contact is lost. so if the transmitter die's or what not, it will return to full brake if you set it for that. Also, most failsafes come with a low battery cut out, which will save you from having a run away if your receiver die's. Also, I would talk to Cen about getting replacement parts for what ever broke due to the bad transmitter. I have dealt with them many times and I am sure that they would be more than happy to help. They will also replace your radio for you at no charge. If you have any more problems with your truck (which one?) let me know.