I used the new FrSky "Hack" module.
This fits into any existing module based system and converts it to 2.4GHz.
To do it, I used a number of things - I used the excellent guide on here written by Damian Gibbs, and a couple of YouTube videos of others converting different handsets using the same hack module.
I basically took the best from all of these to make my own conversion which I think is the nicest of them all.
Damian's is awesome, but at the end, he drills right through the front of the TX and also mounts his module in an awkward place inside the TX. I found that the module locates much better in the void left by the 40Hz module, and the holes for the bind button and LED are better located on the top in front of the aerial.
All in, Im really REALLY happy with the conversion, and Ive already had another couple of KO owners asking me to do theirs too - and now a Sanwa guy is asking me for the same.
The FrSky is a really good system, 1.5km range (!) 2" aerial so it doesnt even need to come out of the car and a very small receiver, but its all easy to bind, setup and uses the latest FHSS so the chance of any interferance on the band is virtually eliminated.
It also has a really nice built in failsafe for any nitro users out there.
Hope this helps.
If you need anything else, please just ask or PM me.
