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So your buddy is telling you to put the leafs from the rear upside down on the front and you'll get 6" of lift?
I think he is getting some lift alternatives swapped.You can put rear springs on the front, but it requires new hangers and I haven't heard of doing it with lift springs.http://diy4x.com/cart/index.php?route=product/product&path=24&product_id=120