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When i tow, im not towing much weight, usually a quad and or dirtbike, or towing the occasional ford out of the snow bank.
Sooooo, shackle flips use the stock springs, but if my springs are old, ill be sagging, right? New, lift springs would give me the lift, with less sag, right? then later, if i wanted more lift, i could add flip shackles on top of the new lift springs??
Eddie
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That's what I would do. Especially if you are planning on more lift in the future. Get new springs now, and then if you want more lift you can add just a 2.5" flip or 4" flip. And I think with the flip you will either need to get angle shims or a rear CV drive shaft to accomodate the pinion angle.
I believe the reason that stock springs with the flip flex better because the stock springs are flatter and therefore flex either way easier. With lift springs there is a bigger arch to overcome. I could be wrong however, that is just how I've always figured it worked.