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Adam
Dodge Dakota
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1/30/2009
14:26:23
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 Subject: 3.9 to 5.9
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Message:
I know it has been asked before and I have been doing research, I just want to hear some other people’s opinion. I have a 93 3.9 with 204000 and the motor is getting tired, IV got the 42rh auto and 4x4 not sure what the transfer case is. I can get a 94 5.9 with 125000 for $250 comes with the flex plate and is a complete motor. I can go to the junk yard and pull the wiring harness off of a 95 318 Dakota. I was just wondering will the 5.9 bolt to the 42rh? And will the torque converter bolt to the flex plate? And will everything else bolt in the same place? I would like anyone’s advice or opinions.
Thanks
Adam
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ya well
Dodge Dakota
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1/30/2009
16:01:45
|  RE: 3.9 to 5.9
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Message:
not sure about the harness
the 93 had a vac/mechanical EGR
the 95 has an electronic sensor on the EGR
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intensedak39
*GenIII*
1/30/2009
21:37:45
| RE: 3.9 to 5.9
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Message:
the 42 will physically bolt up, but you really need a 46rh (a518).
your transfer case should be a np231
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Forseti
Dodge Dakota
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1/31/2009
11:17:27
| RE: 3.9 to 5.9
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Message:
Don't forget that the 5.9 is a external balanced engine while the 3.9 is balanced internal. You will need to add the balance weights to the 3.9 torque converter. I'm not sure about the 93 to 95 but I know on a 99 you can use a wire harness from a 5.2 BUT if your going to use the PCM for the 5.9 you will need to add the extra wires for the O2 sensors I believe the 5.2 used one O2 sensor after the "Y" pipe just before the cat and the 5.9 has two ... one behind each exhaust manifold.
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adam
Dodge Dakota
JOIN HERE
1/31/2009
20:25:41
| RE: 3.9 to 5.9
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Message:
Thanks for all the replies, if I came across a 5.2 would that be an easier swap than the 5.9 being the 5.2 was offered in my gens Dakota’s? and would the 42 be able to take the power of a mildly built 5.2? And is the 5.9 balanced on the torque converter or is the flex plate balanced?
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intensedak39
*GenIII*
1/31/2009
20:57:47
| RE: 3.9 to 5.9
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Message:
you won't need to balance the torque converter if the 360's
flexplate is balanced.
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Adam
Dodge Dakota
JOIN HERE
2/01/2009
19:43:07
| RE: 3.9 to 5.9
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Message:
ok thanks intensedak39 for the help I think I am going to go the 5.2 route I can get one for cheaper and its closer.
Thanks again for all the help
Adam
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Adam
Dodge Dakota
JOIN HERE
2/01/2009
20:18:58
| RE: 3.9 to 5.9
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Message:
Sorry one last question can I use my torque converter or will i need one from a 5.2?
Thanks again for all the advice
Adam
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