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likei tellu
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12/13/2009
16:58:49

Subject: 3.9L to 5.2 or 5.9 engine swap
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hey guys, sad day for my dakota. After 139,1xx miles of abuse,
the 3.9 v6 began leaking antifreeze from a head gasket. She still
runs strong....for now, but i know its time is nearing.

The beast is a 2003 dakota 3.9L 4x4 5 speed SXT

My idea is to find a 5.2 out of something like a dodge 1500.
Apparently the 3.9 and the 5.2 are the same engine, +/- two
cylinders. Also, i believe they have the same bolt pattern as my 5
speed manual. If i'm wrong at any point from here, please, let
me know.

From this point, what sort of extra parts and such do i need? I
know i need something with the ECM, i'm not sure what though.
motor mounts? etc?

I'd also like to change the dashboard from 4 gauges (temp, tach,
speedo, fuel) to the 6 gauge dash that shows oil pressure and
such. I havent done my reaseach on that yet, but shouldnt it just
be plug and play?




Here's a twist. Could i swap the 3.9 for the 5.9? Will the
transmission hold up? will all parts play nice?

Sorry for the long post, and thanks in advance



yes and no
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12/14/2009
02:35:46

RE: 3.9L to 5.2 or 5.9 engine swap
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" Could i swap the 3.9 for the 5.9? Will the
transmission hold up?"

Yes, But not for very long



Forseti
Dodge Dakota
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12/14/2009
10:09:31

RE: 3.9L to 5.2 or 5.9 engine swap
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The transmission from the 3.9L WILL hold up with a 5.2L engine as long as you don't go crazy and race or tow something huge. In your post you talk about the 5.2 first and at the end you say 5.9L .... the transmission will fail quickly from the power of the 5.9L and you will need a new torque converter to make it work right anyway. The motor mounts are the same but you will need a PCM for the 5.2 and you will have to wire the 2 extra injector plugs if you cant get the complete engine wire harness from the donor truck. New fan shroud will be needed as well.



LOL
Dodge Dakota
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12/14/2009
14:03:41

RE: 3.9L to 5.2 or 5.9 engine swap
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"the transmission will fail quickly from the power of the 5.9L and you will need a new torque converter to make it work right anyway"

ow really?
Gee when did they start using a torque converter
on a manual transmission?



Forseti
Dodge Dakota
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12/14/2009
16:35:03

RE: 3.9L to 5.2 or 5.9 engine swap
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So.. i missed the 5speed part... at least I had something to add to the chat unlike you "LOL" you troll



likei tellu
Dodge Dakota
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12/14/2009
18:14:30

RE: 3.9L to 5.2 or 5.9 engine swap
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thanks for the replies.

Can i take the ECM out of a 1998 dodge ram in order to get the
engine to run? (there's a quite a few at my friendly local junk yard)

I called dodge today and they said something about a wiring
harness....here's where i'm starting to get lost



Forseti
Dodge Dakota
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12/14/2009
19:26:36

RE: 3.9L to 5.2 or 5.9 engine swap
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I believe the harness plugs are different between the dodge and ram lines .. you will have to get a 5.9 pcm and engine harness .. or use your old harness .. where are you located ?





likei tellu
Dodge Dakota
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12/14/2009
19:32:13

RE: 3.9L to 5.2 or 5.9 engine swap
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i'm located near philadelphia pa. I think i've strayed away from the
5.9 considering my manual trans wont hold up. i'll go for the 5.2

I dont think i can use the old harness because i need two new wires
for fuel injection?



Forseti
Dodge Dakota
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12/14/2009
19:52:24

RE: 3.9L to 5.2 or 5.9 engine swap
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You can use the old harness but you will need to add the 2 wires .... it all depends on how good you are at something like that and if yo can locate the pins for the connector. What you can do and I have done this before.... go to a u-pull it lot .... find a Dakota that still has the plug ends of the engine or body harness and remove the pins and a length of wire to use on your harness. you will just need to locate where in the connector they need to be added and which injector they are. not too hard if you take your time and think about it before you jump into it



Forseti
Dodge Dakota
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12/14/2009
19:56:26

RE: 3.9L to 5.2 or 5.9 engine swap
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I have a factory service book for a 2001 dakota and so far it has matched up with my 2003 dakota. According to the book the pin location for cylinder 7 injector is #2 on the connector and #13 for cylinder 8. The connector SHOULD have tiny numbers on it you just have to look close. And all the injectors share the same wire for power and on my truck that is the DG/OR wire.



likei tellu
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12/14/2009
21:54:54

RE: 3.9L to 5.2 or 5.9 engine swap
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should there be any issues because the 5.2 wasnt offered in the
dakota after 1999?

Forseti, where can i pick up one of these books? i have a haynes
book, will that have this info?



MC
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12/21/2009
23:34:18

RE: 3.9L to 5.2 or 5.9 engine swap
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I just did a 3.9 to 5.9 swap and adding the two injector wires was quite easy. I did get another harness as a spare and ended up removing what I needed and adding it to the V8. The throttle cable had a different end on it so I grabbed on from th junkyard. You will need a PCM from a V8 to run the injectors. As above you will need a V8 fan shroud and longer heater core lines. E-mail me if you have any other questions but this is not a hard swap. Good luck,

Mike



likei tellu
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12/22/2009
15:56:15

RE: 3.9L to 5.2 or 5.9 engine swap
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hey MC, what year is your truck? and i'm still lost on how to make 2
new wires for the injectors.

Also, out of curiosity, how much $ did your project end up being?



MC
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12/28/2009
17:52:52

RE: 3.9L to 5.2 or 5.9 engine swap
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My truck is a 1998, I used wires from another harness that already had the pins crimped on them. I have plenty of extra injector plugs and will send some to you if you want them. The PCM was 150 used off ebay and 350 reflashed by B&G Chrysler. V8 flywheel used $150, clutch $300, Throttle cable, fan shroud, and assorted junkyard items $80. Used 360 from craigslist $300. New oil pan for Dakota R/T (only use this if putting in 360) $120.

I suggest you stick with a 5.2 to avoid tranny problems and check with B&G on what year PCM's you can use and most likely they will come out of a Ram.

Mike
m.colantuoni@hotmail.com





KK
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12/31/2009
00:23:43

RE: 3.9L to 5.2 or 5.9 engine swap
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Mike,

What tranny are you running with your 5.9 swap. Why do you recommend the 5.2 vs the 5.9 swap? I have a donor engine with the PCM, wiring harness and everything! I am thinking of trading up from my 3.9

thanks!

Kipp



MC
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12/31/2009
16:56:06

RE: 3.9L to 5.2 or 5.9 engine swap
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The 5.2 and NV3500 trans came in Dakotas and 1/2 ton Rams. I used a NV4500 with a 5.9 stroker motor (408). Check on PCM, best bet is one from a 5.9 Ram 2003, not sure if a 4.7 PCM is compatible.

Mike,



KK
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12/31/2009
19:37:04

RE: 3.9L to 5.2 or 5.9 engine swap
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Mike,

I have a donor 98 JeeP GC Limited that I can take anything off of. I was hoping to use the PCM, etc off of that....what do you think??

Kipp



s.m
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1/30/2011
12:01:19

RE: 3.9L to 5.2 or 5.9 engine swap
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I live in n.y does anyone know if i do 3.9 to 5.2 swap in my 2003 4x4 dakota will the state give me a prob because the computer vin dont match the truck?



s.m
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1/30/2011
12:18:48

RE: 3.9L to 5.2 or 5.9 engine swap
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I know that the 5.2L will drop in and i have to use the donor engine and computer harness and fan i just need to know about the computer vin problem.



Likei tellu
Dodge Dakota
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1/30/2011
16:33:31

RE: 3.9L to 5.2 or 5.9 engine swap
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I think you may have to take it to a dealer and get a new vin.
Im curious if the gauges from a 03 will work with a ecu from
99



s.m
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1/30/2011
20:01:02

RE: 3.9L to 5.2 or 5.9 engine swap
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Thanks Likeitellu but im wondering if it will pass n.y inspection do u know anyone who did the swap a had no problems?? I am a mechanic and i know how to do the swap i just dont want to have a problem when i get the inspection done.



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