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Re: bump steer
Axle does not move in a perfect arc around the fixed shackle, as the leaf spring flattens out the axle moves further from the fixed shackle and the steering box.
Your drag link -probably- came from the factory with a downward angle from horizontal so as the axle end of the arm moved up it would move towards the axle and away from the steering box - cancelling out some of the bump steer.
So if you move the box to the front, moving shackle end of spring you need the drag link to angle up the reverse amount it angled down before.
a side view picture of the axle, spring and steering at ride height with wheel off will help this discussion
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