I have a nitro traxxas rustler that came rtr and the frequency to it is a 27. I am wanting to put my EX 1 Mars into it but it is a 75. Can i just trade out the radio and reciever and it run or is there something else i need. If someone can help me that would be great.

thanks

The radio and rcvr have to be compatible. If you change both like you say, and that rcvr has been used with the EX-1 before, it will work in the Rustler.