2000 auto box is jerky

Hi
I am currently a member (****) and love the magazine. I do feel however that
my trusty Rover's autobox is a little jerky and does restrict MPG on my
2000. Do you know of any auto box conversions that would give me a smoother
ride and better fuel economy? I don't mind modern parts - it's just modern
cars I have issues with.

cheers
Keith