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Message: <blockquote data-quote="Zeusmotorworks" data-source="post: 2041586" data-attributes="member: 22315">If it wasn't clear, 1" lift would be the Deaver +3 springs and you would need to add bump strike plates. Now for the type of Deaver spring. You have a choice of SD or HD.SD is around if not the same spring rate as stock. However, Deavers use more leafs for a more progressive spring. People say (I don't know, I have HDs) that they ride SMOOTHER than stock.HD is supposed to give you an extra 450 lbs of weight capacity over OE. So of course they are a "stiffer" spring rate than stock. However, those are also thinner 11 leaf and more progressive vs. the thicker 4 leaf OE springs. So many don't notice the difference in ride. Some DO.</blockquote>