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3.9 to 5.9 swap compatibility

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3.9 to 5.9 swap compatibility

  #1  
Old 04-11-2019, 08:52 PM
Aaron H
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Default 3.9 to 5.9 swap compatibility

Im about to buy a 98 ram 1500 with a 5.9 to use to swap out my 3.9 from my 03 dakota. Will this work? I understand id have to switch the oil pan but other than that just the wiring harness and pcm will all be fine to use in the dakoter? thanks
 
  #2  
Old 04-12-2019, 08:38 AM
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Need to add the wires for the two additional injectors, and flash the pcm so it knows it has a v-8. May have to extend parts of the wiring harness to reach where they need to be. also need to make sure you have the correct flex plate for the 360. Aside from that, pretty straightforward swap.

Moving this to second gen Dakota section.
 
  #3  
Old 04-12-2019, 09:08 AM
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Originally Posted by HeyYou View Post
Need to add the wires for the two additional injectors, and flash the pcm so it knows it has a v-8. May have to extend parts of the wiring harness to reach where they need to be. also need to make sure you have the correct flex plate for the 360. Aside from that, pretty straightforward swap.

Moving this to second gen Dakota section.
I understand but what i was really asking is will the 98 ram 1500 wiring harness and pcm work in my 03 dakota
 
  #4  
Old 04-12-2019, 09:31 AM
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It should. The 3.9 is basically the same engine as the 5.9, just two less cylinders.
 
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Old 04-12-2019, 10:06 PM
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You don't switch wiring harnesses, use the one for your v6 and add wiring for the two injectors.
 
  #6  
Old 04-15-2019, 08:52 AM
Aaron H
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Originally Posted by HeyYou View Post
Need to add the wires for the two additional injectors, and flash the pcm so it knows it has a v-8. May have to extend parts of the wiring harness to reach where they need to be. also need to make sure you have the correct flex plate for the 360. Aside from that, pretty straightforward swap.

Moving this to second gen Dakota section.
Can i just use the flex plate from the ram?
 
  #7  
Old 04-15-2019, 09:38 AM
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Originally Posted by Aaron H View Post
Can i just use the flex plate from the ram?
Yup, sure can.
 
  #8  
Old 04-16-2019, 12:03 PM
XSubaruJeepDude
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Shame the 3.7 to 5.7 isn't as easy
 
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Old 04-17-2019, 01:21 AM
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Originally Posted by XSubaruJeepDude View Post
Shame the 3.7 to 5.7 isn't as easy
Yes it is
 
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Old 04-17-2019, 07:19 PM
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Originally Posted by XSubaruJeepDude View Post
Shame the 3.7 to 5.7 isn't as easy
3.7 OR 4.7 to 5.7 isn't as bad as you might think.
 

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