I wanted to follow up this thread because... um... I guess I like closure.
These springs did indeed have too much arch. My old HF pipe bender, which is useless for bending pipes, turned out to be perfect for leveling these springs out. I stressed them to within 1 inch of flat 2 times then installed. The "pipe bender" helped get the shackles ligned up where they were supposed to be, and the driveline fit as it should. Comparing the pictures of before and after, these pro-line springs have raised my truck about an inch, but the important thing is the ride. The steering and ride is vastly improved.

Thanks all for your help.
These springs did indeed have too much arch. My old HF pipe bender, which is useless for bending pipes, turned out to be perfect for leveling these springs out. I stressed them to within 1 inch of flat 2 times then installed. The "pipe bender" helped get the shackles ligned up where they were supposed to be, and the driveline fit as it should. Comparing the pictures of before and after, these pro-line springs have raised my truck about an inch, but the important thing is the ride. The steering and ride is vastly improved.

Thanks all for your help.
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