I know this has come up in the past but I cant find it. My friend is getting a complete Dodge dually, and plans to part it out into his GM truck. I told him that I didnt think the fronts would interchange but he swears he knows a guy that has put a Dodge 60 in his GM, and its only a 1/4in. difference in the spring pads. BTW he is converting the truck to a dually, and is considering putting in the Cummins also. If ya can't stop.......Smile as you go under!