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2004 4x4 engine swap

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  #1  
Old 01-21-2018, 11:45 AM
oregun
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Default 2004 4x4 engine swap

I'm looking into a 2004 v6 4x4 Dakota with a bad engine.
my question is what are my options for a replacement engine?

I found a 2003 with a V8 4.7l. could I simply swap that in? Or would I need additional comments?
 
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Old 01-21-2018, 12:32 PM
magnethead
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Only thing that can replace a 3.9 V6 is the 5.2 or 5.9.

Only thing that can replace the 3.7 V6 is another 3.7 V6 unless you are electrically inclinded, then an 03/04/05 4.7 can be made to fit.

You may have the 3.9?, but 04 was the transition year I believe.
 

Last edited by magnethead; 01-21-2018 at 10:45 PM.
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Old 01-21-2018, 05:46 PM
oregun
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Thanks. Is there a combatible matrix I can consult? There also a 2002 with a bad 4.7L available locally. Would the same 2003 work in that?
 
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Old 01-21-2018, 08:22 PM
magnethead
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Originally Posted by oregun View Post
Thanks. Is there a combatible matrix I can consult? There also a 2002 with a bad 4.7L available locally. Would the same 2003 work in that?
Probably not. The 4.7 changed considerably in 2002/2003/2004 time range depending on the build date of the truck. Easiest way to tell, one generation has 3 connectors on the PCM (passenger engine bay fenderwell) and the other generation has 4. They're not compatible.
 
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Old 01-21-2018, 10:20 PM
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The '04 should be the 3.7.

The 4.7 should bolt in, the motor mounts/front axle mounts may be different though. Like Magnet says, the engine needs to be from a 4 connector PCM, the NGC version, truck. '03 was the transition from JTEC to NGC.
 
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Old 01-21-2018, 10:46 PM
magnethead
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Originally Posted by 00DakDan View Post
The '04 should be the 3.7.

The 4.7 should bolt in, the motor mounts/front axle mounts may be different though. Like Magnet says, the engine needs to be from a 4 connector PCM, the NGC version, truck. '03 was the transition from JTEC to NGC.
I couldn't remember if the 3.9/3.7 transistion was 03-04 or 04-05. thanks. So many damn changes! haha
 
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