Radio to remote conversion
 

Hi I have a RC rock crawler and I am looking to convert it to remote control for a project I'm working on at the moment, I am trying to make a camera to crawl down drains and record the video footage, the radio transmission is being scrambled and resulting in loss of control with the vehicle so I need to change it to remote wired control, if anyone can give me advice or point me in the right direction to a site that could help it would be appreciated. I just need to convert the car to remote control for the moment, I already have a camera unit that I am attaching to the car but eventually would like to add a gimbal cam possibly all wired down an Ethernet cable.
What do I need to change on the car to do this?