This post tells you the parts you need. I did this right when the 3.3 came out. Dont know if I was the first, but one of the first.
http://www.rc-monster.com/forum/show...4&postcount=46
This is the whole thread where I was trying to figure out how to do it.
http://www.rc-monster.com/forum/showthread.php?t=3588
This should be what you looking for.