Oops, I guess I missread your first post sorry about that.
Anyhow that style of suspension doesn't use a shackle. the spring eye bolts through the brackets below the axle and acts as the bottom half of a 4 bar setup. The upper link has the same pivot track as the spring and is adjustable to adjust caster.
From admiring your work previously I can imagine you would find ways to clean up the setup for a very slick appearance.
I think it would work great with the proper spring rate and shocks for the application.
Last edited by Chopt 48; 06-19-2007 at 10:39 AM.