The front and back don't have to match up. Just make sure the left and right are the same (mine weren't from the factory). I measured to the front-lowest part of the wheel well, and increased from 29.5 to 31 inches. The left side took 5 turns, right was 7 in order to even them out.

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Caver-X
"He who dies with the most toys ...WINS!"
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