I have a 99 F350 with the 7.3L. The label plate on my door jam says 3/99. That would lead me to believe it is an early 99 model, not the 99 1/2+ model. But, I may be over thinking this, they usually stop production of that year model in the middle of the year, then start production of the next years model in the late summer. Long story short, is my truck a early or late year model? What was the big change anyways? Thanks for your help!

 

Are your badges on the fenders near the headlights or on the doors? By your build date I believe it's a late '99. Another way to tell is if the plenum intake tubes are 2" or 3". 2" means smaller turbo, early '99.

 

I have been told If the door tag shows a date under 12/98 it is a early. after 12/98 is a late.

 

If you are referring to the F-350 badge, it is on the fender, but closer to the door than the headlights. If you are talking about the power stroke badge, it is on the door.
As far as the intake plenum, it is definitely a 3" (or bigger) inlet to the turbo.
I have always been under the assumption of a late 99, but figure I should ask before I spend a lot of money on upgrading the intake and turbo.

 

I found this on another forum, hope it helps:

-Early 99 has a wicked wheel in it from the factory, installed in the turbo, and the turbo has a different pedestal mounting set up.

-The early99 has 120cc(AB code) injectors and the late99-03 has 140cc(AD code) injectors.

-The early99 has 2" intake runners. The late99-03 has 3" intake runners.

-The early99 has a 15* swash plate HPOP. The late99-03 has a 17* swash plate HPOP(smaller out put pump).

-The early99 has one glow plug relay. The late99-03 has one glow plug relay and one air intake heater relay side by side. Both relays are on the passenger side valve cover toward the front of the truck.

-The early99 has a totally different air filter that is not inter changeable with the late99-03. But you can put the late99 air cleaner assembly in the early99 truck. The only two aftermarket air filters that work on the early99 are the AFE stage 2 and the AIS.

-The early99 track rod has smaller mounting bolts than the late99-03.

-The early99 has shallower rotors than the late99-03.

-The early99 has shorter hub-bearings than the late99-03.

-The early99 front axle U bolts are square where they go over the spring pack. The late99 U bolts are round.

-The early99 has a different pitman arm than the late99-03.

-The early99 does not have the AIH(Air Intake Heater) like the late99-03.

-The early99 does not have the automatic transmission fluid cooler in the radiator(Just has an Air to Air cooler).

-The early99 has no indicator light showing that "cruise" is on. Late99-03 has a cruise light that will come on when you set the cruise control. The early99 truck has the light in the dash already. A newer PCM(Yes it will plug in and will run better too) must be used to make the cruise light illuminate. It is a green light on the right side edge, half way up.


-Additionally just because the "different" powerstroke badge is on the front fender does not necessarily mean it's an early 99.

 

DELETED: TOO SLOW LOL