Differences between a Early 99 and Late 99 7.3
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Diesel Bomber
Joined: Sep 2007
Posts: 7,638
Likes: 638
From: Bend OR
Differences between a Early 99 and Late 99 7.3
Early 99 has a wicked wheel in it from the factory.
The E-99 has 130cc(AB code) injectors and the later 99-03 has 140cc(AD code) injectors.
The E-99 has 2" intake runners. The later 99-03 has 3" intake runners.
The E-99 has a 15* swash plate HPOP. The later 99-03 has a 17* swash plate HPOP.
The E-99 has one glow plug relay. The later 99-03 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 E-99 has a totally different air filter that is not inter changeable with the later 99-03. But you can put the late 99 air cleaner assembly in the E-99 truck.
The E-99 track rod has smaller mounting bolts than the later 99-03.
The E-99 has shallower rotors than the later 99-03.
The E-99 has shorter hub-bearings than the later 99-03.
The E-99 front axle U bolts are square where they go over the spring pack. The later 99 U bolts are round.
The E-99 has a different pitman arm than the later 99-03.
The E-99 does not have the AIH like the later 99-03.
The E-99 does not have the automatic transmission fluid cooler in the radiator.
The E-99 has no indicator light showing that "cruise" is on. Later 99-03 has a cruise light that will come on when you set the cruise control. Some of the E-99 trucks have this 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.
The E-99 has 130cc(AB code) injectors and the later 99-03 has 140cc(AD code) injectors.
The E-99 has 2" intake runners. The later 99-03 has 3" intake runners.
The E-99 has a 15* swash plate HPOP. The later 99-03 has a 17* swash plate HPOP.
The E-99 has one glow plug relay. The later 99-03 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 E-99 has a totally different air filter that is not inter changeable with the later 99-03. But you can put the late 99 air cleaner assembly in the E-99 truck.
The E-99 track rod has smaller mounting bolts than the later 99-03.
The E-99 has shallower rotors than the later 99-03.
The E-99 has shorter hub-bearings than the later 99-03.
The E-99 front axle U bolts are square where they go over the spring pack. The later 99 U bolts are round.
The E-99 has a different pitman arm than the later 99-03.
The E-99 does not have the AIH like the later 99-03.
The E-99 does not have the automatic transmission fluid cooler in the radiator.
The E-99 has no indicator light showing that "cruise" is on. Later 99-03 has a cruise light that will come on when you set the cruise control. Some of the E-99 trucks have this 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.
Last edited by CSIPSD; Dec 13, 2010 at 10:18 PM.
Diesel Enthusiast
Joined: Mar 2010
Posts: 371
Likes: 10
From: Norwalk, IA
Not tryin to be a wiseguy or nothing, but K&N an a few others make intakes too. I'm running K&N on my E-99.
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Diesel Bomber
Joined: Sep 2007
Posts: 7,638
Likes: 638
From: Bend OR
There is a seperate cooler on the front of the truck.
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Diesel Bomber
Joined: Sep 2007
Posts: 7,638
Likes: 638
From: Bend OR
There is NO intake air heater on a early 99. If you have a intake air heater in the Y pipe in the valley, you do not have a early 99.
