I think they're the same, but just wanted to confirm. I'm very limited in spring selection with a 1 ton rating, and the springs are much stiffer of course. I'll trade the load capacity for more flex if they will fit. I'm planning on 4" TC HD's if they will fit, and a 4" shackle flip in the rear. I'll probably remove atleast the overloads in the rear to help with flex.