Brake Boosting Vid

Driving to work i was talking to another truck guy and asked for a vid of brake boosting. I was WOT in 1st gear and 4wd. It wont rev past 2200 and kinda studders there which is only 5psi. stock convertor is holding me back from 8psi launches

http://m.youtube.com/watch?v=0mlyQ1bwYMA