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  #1  
Old 09-03-2011, 10:00 PM
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4.7 or 5.9 swap?

Ok so I have a few questions and I hope I can get them all answered.

For one.....What would be better to go with as a swap, a 4.7 or 5.9?

Second......What is the difference between a 4.7 and 5.9 when they are both a V8?

Third.....How hard would it be to swap?

Fourth......If I was to buy one of these engines and it has close to 100,000 miles on it and I rebuild it clean everything up is there a possibility that the engine could crack on me even though everything is new?

Last.......Will my 3.9 tranny transfer over to a 4.7 or 5.9?

Please get back to me. I am in need of a swap soon.
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  #2  
Old 09-03-2011, 10:49 PM
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You can only swap in a 5.9. The 4.7 uses a different bus communications, as well the 45/545RFE trans, your 3.9 uses the 42RE series trans.
The only way freshened engine will prematurely fail is because of poor workmanship.
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  #3  
Old 09-04-2011, 03:21 AM
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The 4.7 is a more technologically up to date engine compared to the 5.9, with overhead cam shafts instead of pushrods. the 5.9 is based on a engine design from the 60's
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Old 09-04-2011, 04:45 AM
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So the 5.9 would be the swap to do for those guys running 2002-2004 dakotas? The reason I ask is because there was no 5.2 offered in 2003 and with the century key security. There is no computer for the 2003 trucks even if you wanted to swap a 1999 5.2 in.
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Old 09-04-2011, 04:45 PM
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well looks like i will have to get the 5.9. i want to get the same year model as my truck just so I know things will fit right in.
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  #6  
Old 09-04-2011, 11:38 PM
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The 4.7 gets better milage than the 5.9, so it would probably be the better swap in the long run. It will bolt right in but you may have to get more parts from a donar truck to make it work. Mostly the trans and wiring/computer, but you will need all that for a 5.9 swap also. Downfall of the 4.7 is it's fairly expensive to rebuild, I've found all the parts to cost nearly twice that of Hemi parts. Its quite a bit more work, but if you're already swapping why not go with the 5.7 and get way better milage and tons more power than either other engine.
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Old 09-05-2011, 01:10 AM
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ok so i have everyone telling me different things. everyone so far is against each other. what i am trying to go for is something that is within the 2002 year. reading up on it 5.7 wasnt even in my generation. still i am looking towards a 4.7 or 5.9. so to refrain back to my questions i am needing to know what will be an easy swap and still have power. i am not worried about fuel mileage.
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Old 09-05-2011, 04:31 AM
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5.9 = More torque, more hop up parts, Parts are more available and CHEAP, you can keep your transmission(I Think)

And also, the 5.7 was never offered in any Dakota. The 4.7 became the only v8 available in Dakota's after 2003.
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Old 09-05-2011, 04:39 AM
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5.7 is the chevy 350.
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Old 09-05-2011, 06:40 PM
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oh hell no. why would i put a chevy engine in a dodge. that is a disgrace.
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  #11  
Old 09-05-2011, 06:44 PM
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there's also a 5.7 Hemi
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  #12  
Old 09-11-2011, 06:06 PM
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If you live in a state that is a bitch with emissions, then go with the 5.9..My r/t is great..keep the low clean and they last forever.. If I had some extra money, and the emissions police arent too bad, I would go the 5.7 hemi route..
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Old 09-11-2011, 06:18 PM
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I agree with the 5.7 hemi route.

Just get the wire harness, computer, and MAYBE a guage cluster out of a 01+ dakota/durango with the 4.7 if your cluster wouldn't work.
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Old 09-14-2011, 08:01 PM
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if i wanted to take a 5.9 engine out of a ram what would i need and what year would i need. i found some 98 and 97 models but my truck is a 2002.
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Old 09-14-2011, 10:07 PM
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Look for anyone parting out 2002 Rams. That year was the last year of the 5.9, so you won't have any issues with bus comms.
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