Otis,
Check these guys out. I talked to them at SEMA. They have the stand alone controllers, but they also have a valve body that converts the 4L80E to a 5 or 6 speed and paddle shifters! All the gears are already there. It looked to be an easy conversion.
http://www.powertraincontrolsolutions.com/product/6-Speed-Valve-Body/
Joe
Check these guys out. I talked to them at SEMA. They have the stand alone controllers, but they also have a valve body that converts the 4L80E to a 5 or 6 speed and paddle shifters! All the gears are already there. It looked to be an easy conversion.
http://www.powertraincontrolsolutions.com/product/6-Speed-Valve-Body/
Joe