Engine swap

Tiny
LACI HODGE
  • MEMBER
  • 1997 DODGE DAKOTA
  • 3.9L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Can a 3.9 engine be swapped to a 5.2 with the only exception being a 5.2 wiring harness and ecm?
Monday, May 15th, 2017 AT 9:59 AM

11 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,465 POSTS
Not easily. You would need to be sure that every module that was on the 5.2 version is the same as the 3.9. You would be changing the trans as well so you need the controls for that, plus the full harness for it. You would need to check that the dash and BCM are compatible as well. Nothing like getting everything together and discovering it will not run because a sensor uses a different signal that the sensor you have, and they do not interchange.
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Monday, May 15th, 2017 AT 11:01 AM
Tiny
JADENEBALSTER
  • MEMBER
  • 5 POSTS
  • 2000 DODGE DAKOTA
  • V8
  • 4WD
  • AUTOMATIC
  • 158,000 MILES
I have a 2000 Dodge Dakota Sport with a 4.7 liter engine that is wrecked. I have found a 2004-2006 VIN "M" engine. I was wondering if that engine will work in my pick-up.
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Friday, May 10th, 2019 AT 6:32 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
We always recommend using direct fit parts because when you change things, problems always show up. If the engine is a 4.7L, it will bolt up for you. However, you will most likely need to chance the injectors, sensors. It can turn into a headache really fast. 2000 2003 has a 16 teeth ringtone gear 2004 has 32 teeth ringtones year and that’s changeable by inside the engine. If you just take the warren harness from your 2000 long would you computer it will work I’ll I swapped an 01 put it in a 04 truck
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Friday, May 10th, 2019 AT 6:32 PM (Merged)
Tiny
JADENEBALSTER
  • MEMBER
  • 5 POSTS
Thank you very much. I had a pretty good idea that it would not work very easily but I thought it wouldnt hurt to get a second opinion. Do you, by any chance, know where I can get a good 2000 Dodge 4.7L engine at a reasonably decent price?
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Friday, May 10th, 2019 AT 6:32 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
I wish I could help with that, but I'm near Pittsburgh, PA. Honestly, if you plan to keep the truck for a long time, check some of the nationally recognized parts stores. Most of them sell rebuilt engines at good prices and they come with a good warranty.

The engine you can get (the newer one) will bolt in. However, you will need to switch the sensors with yours, the injection may need changed and vacuum trees / locations may need rerouted. I hate to say, "It won't work, " but it will take a little extra time to switch things, and sometimes I have run into engines that don't even have a place to screw in a sensor that was on the original engine.

If you take your time and really inspect both, side by side, it may not be a hard switch. However, it is the policy of 2carpros not to advise anything other than a direct fit just in case there are differences that will lead to bigger problems.

If you live in PA (I realize the chances are slim) let me know. I have a friend who owns two salvage yards. Infact, I plan to visit him tomorrow AM. If you want, I will ask if the two will change with little trouble.

Let me know.
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Friday, May 10th, 2019 AT 6:32 PM (Merged)
Tiny
JADENEBALSTER
  • MEMBER
  • 5 POSTS
Actually, if you wouldnt mind asking him, that would be great! I have a brother who is a mechanic and can do it and get any thing we need, I just needed to know if it is possible, but I dont know if I plan to do that. Thanks you for your information too! It has been very helpful! Just get back to me if you find anything out.
Thanks!
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Friday, May 10th, 2019 AT 6:32 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
I will check for you. Right after work, I have to go to another *& % graduation party, so it may be later in the evening until I can reply.

When I graduated, it was expected. Now I'm going broke handing out money to kids who did only what was expected of them. I guess I'm getting old.
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Friday, May 10th, 2019 AT 6:32 PM (Merged)
Tiny
JADENEBALSTER
  • MEMBER
  • 5 POSTS
Hahahahahaha. Anyway, that would be great! :) When ever you can find the time for it.
Thank you so much!
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Friday, May 10th, 2019 AT 6:32 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Don't get it. There must be a difference. THe only ones they recommend are a 99 / 2000 switch. From 04 to 06 will not work. He told me it deals with sensor changes. Stay away from it.

I wish I had better news, but they have a cross reference program on their computer and that is what it showed. However, if you can find a 4.7 from a 2000 Durango or Jeep Gr. Cherokee, he said they will work.

Let me know if you have other questions.

Joe
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Friday, May 10th, 2019 AT 6:32 PM (Merged)
Tiny
JADENEBALSTER
  • MEMBER
  • 5 POSTS
Ok, thank you very much. I knew a lot of changes would have had to be done, I just wanted a second thought on it. Thanks you for all the information!
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Friday, May 10th, 2019 AT 6:32 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Glad to help. Let us know if you have questions in the future.

Joe
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Friday, May 10th, 2019 AT 6:32 PM (Merged)

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