[Ackattack]

I use the TPI computer to control my lock up.

But, if you look at the wiring diagrams and do a little reseach you should be able to hook up your own lockup switch yourself. If I remember right, its a 5V signal to the tranny. you could just wire it up so that on the highway you flip the switch and it locks up, otherwise run it unlocked. But it wouldn't really be integrated and as convienent.