I'm using an 86' C10 Saginaw box with a kit from Brothers Truck. So far the only draw back I see is that you need to reinforce the frame at the mounting position. I am still working that out. The drag link and pitman arm were straight forward, just adjust the length and your good to go.
I can see reinforcing the mounting point. The GMC I'm working on has a much larger front cross brace engine mount than what is on a comparable chevy. But if going that route I will definitely beef it up , thanks.
I was told about the degree shims to help out with caster. But I seem to remember that only 4 degrees was recommended.
