For the guys that know powerglides, is it possible or are you suppose to beable to use the transbrake in high gear? Or could you launch on the brake in high gear? Im told its impossible to use the brake when in high gear and another guy says on accident he has done it. Whats the truth to this?

 

The trans brake will not work in high gear.The only way it will work in high gear is if the linkage is not adjusted properly.