**raises hand**
I bought the GRC lock out kit when I first installed the T56, it worked great when I had the vss from the dakota digital gauges hooked to the stock ECM in my car. When I took the ECM out, the reverse lockout quit working as well.
Two years later, I still haven't found time to crawl under the dash to figure out what to rehook it too so it gets a speed signal. Sounds like a good project for tomorrow morning.