3rd Gen Engine and Drivetrain -> 2003-2007 5.9 liter Engine and drivetrain discussion only. PLEASE, NO HIGH PERFORMANCE DISCUSSION!

04 5.9 engine replacement

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Old Mar 28, 2012 | 06:16 PM
  #1  
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From: Pa
04 5.9 engine replacement

I am replacing my engine, do I need to replace it with an engine from a 4x4 automatic or that makes it easier?
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Old Mar 28, 2012 | 06:22 PM
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From: Nanoose Bay B.C. Canada
Should be able to use any year just make sure you use your ecm from yours as well as all the sensors and wireing harness...might have to swap injectors but check on that,
.
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Old Mar 28, 2012 | 09:31 PM
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From: Claxton, GA
Which engine do you have? Need more info on your truck. 04 has an SO, HO 305/555 and the 325/600 HO engine.
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Old Mar 29, 2012 | 09:23 AM
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I have the 325/600 ho motor
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Old Mar 29, 2012 | 09:30 AM
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From: Claxton, GA
So you have an 04.5. an engine from 04.5 to 07 will work. In the later model trucks you may have to the change over the rocker box, valve cover, and possibly the front cover.
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Old Apr 2, 2012 | 01:01 PM
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spooler, you say I may have to change front cover and maybe rocker box? why if I am changing whole motor
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Old Apr 2, 2012 | 05:18 PM
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From: Claxton, GA
Different electrical connections for the injectors (harness), and different mounts for the fan and shroud.
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