another thought for the 5 speed guys...
use a 6 speed shift lever and use the manual button to activate/deactivate...
I havent sent you a PM but please put me at the top of your list. I think I have bugged you long enough about it
I hate to muck up Ben's thread and please feel free to remove this is you feel it is inappropriate, but can't this be done with TCM programming? I assume most are going to be using this to unlock the converter for 4th gear? That would be really easy. If you're wanting to do it to unlock it in 3rd, you could just make it so it unlocks if the wheel speed drops below a certain point.
I'm no puller, so I have no idea. I was just wondering. Thanks for the explanation.