High Altitude Camshaft Selection

I run my GV as a splitter. The GV comes with a little black logic-box of some kind; a computer I assume.Hooked up per their instructions, it was very slow;suitable or O/D only. I found that when direct shifting it with battery voltage it shifted like lightning. The shift button I mounted in my shifter ball;push-on/push-off.The GV logic-box prevents engagement in reverse. My direct wiring did not.SO,I put a little red LED under my tach to tell me when it was selected.
Well ONE time I forgot to look for the light before I backed up.Within 2 ft everything got tight. This being the first time this happened I didn't clue in, and just gave it a bit more gas. Bad move; Everything locked up. Then it clicked! Doh! And it didn't shift right after that, so out it came and off it went ,back to GV.Lesson learned. It's never happened again.It now has over 80,000 miles on it.