Welcome to the Stovebolt Page! We would love to see pictures of your Chevy. There are others who know more and maybe one of them will respond soon. This I know from owning 3 Advance Design 3600 trucks: they are quite different from their 3100 brothers, especially in the axles/springs/suspension department. Interestingly though the front springs are the same for 1/2-ton and 3/4-ton. I am not familiar with the Posies but
Patrick's sells a single-leaf front spring to lower the front. What do you really want to do with your truck?
