A lost cause trying to get a F53 to ride like a DP chassis. You're talking about a old school straight axle v/s independant suspension. The up side is that the Ford only has 4 grease fittings on the axle and if you keep them greased, the front end will never wear out. A lot more moving parts to fail on the Diesel BUT you get the nice ride. Unless you are regularly bottoming out the suspension on the F53, the Sumo springs won't make the ride much softer but if you are where potholes are a big problem, the Sumos will take a lot of the crash out of them.