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/
A forum community dedicated to Chevy C10 and vintage truck owners and enthusiasts. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more!