This is what will happen, first to second gear will go smoothly, shifting into third under power will be something that will make you cringe. As the input shaft and output shaft come together at the third gear it is a week point in the transmission. The pressure will push the gears apart and destroy the main third gear and cluster gear if not more. Ask me how I know that with a lot less horse power. Liberty Gears told me that would happen, took me 3 times to figure out. Spend a little more on a good transmission now and you will be $$$ ahead.