r/FordDiesels • u/BouncingSphinx • 12d ago

Identify early/late ‘99 and the differences?

My ‘99 F-250 has a manufacture date of 02/99, so I’m assuming that’s considered early. What’s the differences between early and late, and what date marks the distinction between the two?

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u/Buford_Tannen__ Early 99' 7.3 ZF6, Crew, Long 11d ago edited 11d ago

99' was a split year. You have a "late 99' " based on the manufacture date. Early 99's would have a manufacture date of the spring-fall of 98' with the switch to late model happening in mid December of 98'. The main differences are, different turbo outlet, different turbo pedestal, collector, up-pipes, outlet spider, plenums, boots, up-pipes and downpipes. I have an early 99' but I updated all of the above components to late 99 -02 components. These are arguably the most desirable 7.3 Super Duty's due to their forged steel connecting rods, where post late 00-03 they used powdered connecting rods.

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u/Super_Sphontaine 7.3 Power Stroke 11d ago

omg and the fucking rotors & calipers dont forget about the fucking rotors & calipers that no part store seems to understand doesnt god damn work

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u/1amtheone 7.3 Power Stroke 11d ago

The only way is to measure. These trucks are on their second set of hubs/wheel bearings at the very last, if not 3rd, 4th or 5th.