I guess my thoughts in using 20's were to have a none lowered truck with eaton detroit rod ride spings and a full fender well. I want to do something unique that makes people say thats cool but at the same time be able to drive and enjoy my truck. The problem I face when wanting to use 20's is the power steering issue. I will be using the p.s unit from classic performance and I have heard that you can not use a wheel with 3.5 inches or more of back spacing. I think I am now leaning towards the 18's or slamming the truck with a dropped axle and set of springs. Unless someone makes a bolt in kit that uses G-body parts I will stay with the strait axle. I believe mustang 2 suspension is not an option for my truck.