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47" in the 67-72's and 49" in the 73 and ups
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A friend of mine has a 68 and there is not a lift kit made for it, the springs are shorter than the 69-72. I don't know for sure what they measured (probably 44" as el diablo mentioned above) but he had to have custom springs made for the front. He had 14" lift springs made for it.
El diablo, what year is your truck?