lowering a F150
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I believe the Lightnings are only lowered 1" front and back from the factory. Plus the shorter tire diameter on the 18's make them .75" shorter (28.5" vs. 30") than reg F-150 tire diameters. So a 2/3 drop should get you close. I have a 3/4 drop on my truck with the 20's retaining the stock tire diameter:
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