twin I beam
Twin I beams work ok as long as you run the load on the truck the same as the alignment. The problem I had was on my 85 one ton the previous owner had it set with a huge cab over camper. I had and alignment done with minimum load since I pulled heavy loads in my big trailer. If you want to stay all ford you can check the Ford truck forums for using a Ford aerostar mini van front crosmember or an later Crown Vick crosmember front suspensions. or since Ford owned Jaguar for a while a Jag xj6 crosmember suspension swap and even mabe the Jag rear Irs.