Ross, would it be possible to add a "Hold 6th" button to the LB7/LLY Allison DVT for those that have the Suncoast 6 speed upgrade? For those that don't have it, and have a 5 speed TCM & VB, I suspect one of two outcomes if one tried to use it: Either the TCM would yak on the command and not do anything with it, or it would accept the command and the transmission would drop to Neutral and probably give a "Shift Range Inhibited" (I've had this hapen several times with the A40 in my truck).