Willyv

Hi first time post here! I have a 2007 landcruiser v8 with the 5 speed auto. I want to know 2 things 1 what speed should the converter lock up at ? 2 should the auto change down when going down a hill to give you some form of braking? Such as when I am doing around 80 then coast down a hill and touch the brake slightly my gears change down 1 gear so from 5 to 4th thanks in advance!