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Hey so i Just traded my 2003 F350 7.3 crew cab lariat for a 1999 single cab 7.3....Right? So I didn't even realize it was an early 99 at first... till I saw it in person. Ive heard a couple different things but wanted to hear all your input. The main question I'm really trying to ask is.. what makes an E99 so different from the rest of the 7.3s. ( Weird quirks too ) I'm Also very new to the Powerstroke forum so any advice would be great!.... I sure wouldn't want to offend anyone >:) Thanks!
 

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E99’s have smaller turbo’s, slightly different intake spiders, smaller injectors, I believe the wiring harness is a lil different too. Like the e99’s only have one relay by the fuel bowl and others have 2 (I can be wrong on that one). I think there’s some other things slightly different as well, just not remembering right now lol


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The turbo is the same size internally just like the L99. The dimensions are different. The injectors and hpop are slightly smaller but you really won't notice it unless it's tuned and in the higher hp tunes. The e99 does only have one relay vs the L99 has two, one for the glow plugs and one for the aih. The front suspension is a touch different too. Ubolts, track bar and unit bearings. You can use L99 unit bearings but you have to buy new L99 rotors too.
 

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BigRed02
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Square front ubolts?


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Regarding the whole truck, there are a bunch of these lists out there, here is one from elsewhere for reference. I didn't check for accuracy, just a copy/paste:

Early 99 has a wicked wheel in it from the factory. And much smaller turbo (spools faster, though)
The early99 has 120cc(AB code) injectors and the late99-03 has 140cc(AD code) injectors.
The early99 has 2" intake plenums. The late99-03 has 3" intake plenums.
The early99 has a 15* swash plate HPOP. The late99-03 has a 17* swash plate HPOP.
The early99 has one glow plug relay. The late99-03 has one glow plug relay and one air intake heater
relay side by side (along with early '99 CA models) . Both relays are on the passenger side of the ful
bowl toward the front of the truck.
The early99 has a totally different air intake that is not inter changeable with the late99-03 (except for
DRW trucks) . But you can put the late99 air cleaner assembly in the early99 truck. The only three
afterarket air filters that work on the early99 are the AFE stage 2, the AIS and the KWIKK 6637.
The early99 track rod has smaller mounting bolts than the late99-03. (except for DRW trucks)
The early99 has shallower rotors than the late99-03. (except DRW trucks)
The early99 has shorter hub-bearings than the late99-03. (except DRW trucks)
The early99 front axle U bolts are square where they go over the spring pack. The late99 U bolts are
round. (except DRW trucks)
The early99 has a different pitman arm than the late99-03. (except DRW trucks)
The early99 does not have the AIH like the late99-03. (except CA model)
The early99 does not have the automatic transmission fluid cooler in the radiator.
The early99 has different size swaybar.
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 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.
 

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The early99 front axle U bolts are square where they go over the spring pack. The late99 U bolts are round. (except DRW trucks)
The early99 has a different pitman arm than the late99-03. (except DRW trucks)
This is confusing to me. What front axle spring "pack"?
 

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4x4 trucks have leaf springs.
 
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