I'm in the process of linking the front of mine with a waggy 44 and was under the assumption I'd have to get the astro box. It's sitting on the factory leafs for now, but I pushed it out 6" and rebolted it to the springs. The steering gear output is centered directely over the tie rod. So the way I see it the drag link would have the same angle weather it's to the rear with the factory box vs. to the front with the astro box and IMO it's better to have it tucked up behind than having the pitman arm hanging out the front and getting snagged.
Maybe it's the way my 44 is set-up but you may want to see what it looks like with your axle pushed out to where you want it before deciding which one to go with.
I've got the waggy springs and I pushed an additional inch forward initially. I found out that it would hit the pumpkin occasionally. I'm back to the waggy stretch for a little while until I get my steering fixed up.
I used the stock springs and moved the spring hangers forward. I moved them about 5 inches. In the process I did a shackle reversal and used boomerang shackles in the rear. I have a high steer setup on a front ford dana 60. I had to go with the stock pitman arm because the drop down one would've bound up.
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