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The main difference is the thickness of the rails. The L rails were formed from thicker steel. I think there are also some stiffening braces that the std. F-150 didn't get, but I don't remember for sure.
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1990 F-150XLT Lariat Stillon the original engine with no squeaks or rattles at over 300k miles
4.9/M5OD/3.08
16.89@77.09
145 rwhp, 272 rwtq
2001 Lightning #127
13.18@104, no chip, no pulley, no nitrous
Confuscious say "Man who have no use for jackstand have promising career as jackstand".
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