Here's an Idea I don't know how well or if it would work, but what about instead of just using a piece of tubing in the front for a through the frame shackle mount use an orbit eye or a jonny joint, or which ever suits your fancy, You would probly have to make some sort of missalignment bushings, since the frame there is at an angle but what do you guys think.
The reason i ask is cause I plan on putting some 51" rears up front, and have to move my shackle back some.