The demon trans brake is a "real" trans brake. It locks the trans in 1st and 2nd at the same time. Old ones would do 1st and reverse they did it this...
it looks weird but i already test the car lets say at 30mph put it in neutral and rev the engine still it will reach 4,000rpm then starts to climb up...
Do you think I could load in an earlier program and see if that works? I may have the stock tune. I have a buddy that works at a GM dealer that could...