Idk if this would work, but have you tried renaming it without a dash in it? To me it feels like Torque doesn't like dashes.
Removing the Dashes doesn't make a difference, but I'm going to keep it as it is without dashes as it says in the code on the OP.
If I'm not able to make this function work, my alternative is to use your crouch key (main cases: shift). The only thing I need to know when I'm at the point where I can't make the speed animation function to work is what is the pieces of coding I need to know to check if the player is pressing the crouch key in the vehicle? Kind of like when you check to see if the player tries to turn his light on but instead car lights come on, but instead of your light key, it's the crouch key.