[Nick_R_23]

I just completed a 4.5/6 on my 86 C1500 Longbed, you can check that out in the thread with the part numbers listed and a side shot to see how that looks for you, or if you’d like to go lower. Any more than a 6” in the rear will pretty much require a frame notch, and being a longbed you may also be modifying the bed support rail to fit a longer shackle if you plan on going that route.