I'm bought the Street Bandit Shifter from B&M. It comes with a couple different shifter plates, including one for the 4L80. I called B&M and was told it would work no problem. I'm still in the parts collecting business at this time and yet to install it, so I can't verify if it works or not.
http://www.bmracing.com/index.php?id...subcat=1&pid=2