If you have a JR Z-1 or R-1, you can install a Spektrum Module in the back of your radio to replace the 27MHz or 75MHz one. It's a plug-and-play install. If, however, you have like an XS3, XR2i, or any of those radios that don't utilze a module, you will not be able to upgrade and would need to replace your radio if you wanted to make the switch. Here's a link to more info for you

http://www.spektrumrc.com/DSM/SurfaceProducts.aspx