I did the ORD shackle flip on my 69 K20 but don't think I will do it on the Blazer since it moves the axle forward a bit. The axle moving forward didn't matter to me on the K20 since I went with a flatbed, but I don't think I would want that to happen on the Blazer. I think when I'm ready to change this, I will go with 6" new springs. Not ready to rule out options.