Join Date: Dec 2006
Location: Middleton, Idaho
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The cut off date for the early 99 is 12-7-98, anything after will be a 99.5.
They changed some of the suspension after 3-1-99, so someone might have an older suspension with the newer motor. The early 99 will have a smaller turbo than the late 99's, but you won't have the turbo surge that goes with having that bigger turbo. Injectors are a 120cc split shot, 140 split for the 99.5. The older 7.3's had 90cc single shot I believe, and you can really hear the difference. The early 99 puts out about 235 HP vs 250 for the 99.5.
I think that the HPOP is 15 degree's vs 17 for the 99.5 which is where some of that extra horsepower comes from. I don't know what they are asking for your truck, but 100,000 miles? She is just getting broke in
With a few simple mods you will be enjoying her for years to come!!!
Early 99 F350 4X4 6SPD Crewcab Dually
6637 Air Filter, MKO 4" turbo back to 5" straight pipe Exhaust 6" tip, Isspro gauges Pyro, Boost, Watertemp, DP Tuner, Stock 40tow,60tow,80econo, 120race, KCM S.S. HPX line, ITP Overboost Annihilator.