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The leaf springs and shocks from a late 99 will work on an early 1999. The early 1999 just used a different u bolt (square) vs late 99 has a semi round and round option. but the leaf springs are the same. The early 1999 also has a different pitman arm, and different offset rotors for the front (rears are same early/late 99).
I have an early 1999 running late 1999 leaf springs lift kit with just the needed square ubolts. The x codes will treat you nicely as they are designed for trucks that use a plow (handle more weight). I would double check leaf springs to see if there are any differences between the cab n chassis vs regular superduties just in case though. I know the cab n chassis has a lot of the same parts but the rear end/frame gets to be very tricky trying to match up parts etc.
Since you haul a lot the x codes and shocks for a 2in level kit would probably all you need. I installed a 2.5in level kit with aftermarket shocks and an aftermarket track bar it seems it was 50/50 people needed the track bar. But, what happens is the new front leafs settle after about 6 months and the oem track bar fits again lol. now I have this expensive pmf adjustable early 1999 track bar that I don't need hahaha.
-99 F250, 4X4, 6.0 trans cooler, 08 mirrors, 05 grill, AIS Intake, lvl kit, JW Vbody, cncfab hpop lines, WW2.
04 Excursion Modified, 04 F350 Modified, 06 F350 Modified
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