[DakFink]

A lot of Hemi swaps going lately, which is a really good thing.
A lot of pictures to follow along which is also a good thing.

There is 1 thing lacking the ELECTRONICS part.

I know there isn't much that can be shown with pictures and talking/writing about isn't that exciting either. I'm an electronics guy by profession and training coordinator to boot. I know how dry the stuff is.

BUT I would like to see some plain and simple feed back from some of those that have done the swaps and what they have found out.

What year Daks would be the easiest and which would be the hardest?

I did notice Mention of 2 different CAN types used (2-wire and 1-wire). What year Dak and What year Hemi vehicles use those?

What wiring harnesses to use.

Reason I throw this out there is because I have no daily driver right now and looking to buy when I return home. With a swap in mind from the beginning, what year Dak would be the easiest?

And for those that have a Dak already what exactly are they up against electronically.

I just spent the last week studying some info on the Chrysler Crossfire.

A guy in Dallas just finished putting a Mercedes V8 in his. Which a lot of so-called MB experts said couldn't be done.

Not only was it possible! He did it with all MB parts, it looks Factory, runs on factory software, no electronic conflicts, and he didn't have to modify but 2 wires that were just too short.

Only 1 issue he ran into, the car will not start with the key. He had to install a Start Button (which I am fine with, done right actually looks kool). He and his MB contacts think it is because they used an ECU from a car that uses and RF Key not a mechanical key. Unfortunately only 3 cars with the same ECU use a mechanical key, only 1 uses a V8. Last I read he was going to attempt to use an ECU from that car and see if he gets his Key Start back.

After he was done and running He also went into details of what too look for when buying an engine, wiring Harness and ECU from a Donor car so you can make everything work with minimal issues.

Granted it was by no means plug and play. Mechanically everything went together like factory (engine wiring harness ecu etc)

Where he ran into issues was the Association of the Contol Modules through out the vehicle. Which he solved with a Copy of MB C3 Star system and a guy that has the capability of resetting the VIN number in the ECU. (IE: virgining the ECU)

Luckily we don't have to go that deep in the software!!

I think I do remember someone that was going to do a 4.7 to 5.7 swap saying that they put the 5.7 PCM in their truck and it ran. If i am remembering correctly what ever year this was would probably be the easiest to swap.

From my understanding about the only difference on the engines (4.7 to 5.7) as far as connectors go is the Electronic Throttle on the TB.

All those that know the details please share.

Thanks,
kenny

 

[DocZ]

I'd like to know if having an 03 dakota would make the swap any easier.
Would it be possible to have the 03 ecm run the engine with tuning? Will the hemi ecu and harnessa swap into an 03 easier than the earlier models?

 

[usmrocks]

i think if you have a 4.7 or a 3.7 that makes it easier and i also think that the 200?-2004 is easier.

 

[69rrbruce]

2000 & older Dakota use 2003 Hemi or you will have to get 2001 & newer gauge cluster due to the difference in buss system.
2001 & newer Dakota use 2004 & newer Hemi.
As far as the wiring harness you should use the Hemi engine harness and the Dakota Power Distribution Center (engine compartment fuse box). The 2003 Hemi engine computer and trans computers are separate whereas the 2004 & newer they are combined. I would avoid the 2003 version, if you can, as it isn't supported by DSP tuners. This is only critical if you intend to cam your engine.
Oh ya the wiring. you need to study the wiring diagrams of the Dakota nad the Hemi for hours and hours. If you get the engine harness for a 2004+ Hemi you will find that three out of four 32 wire connectors on the Hemi engine computer for the most part go directly to the engine/trans. You will need to get a 32 wire connector for the fourth connector. This connector is the one you need to splice into the Dakota's engine bay wiring harness, mostly to the PDU and some to the guage cluster, throttle pedal drive-by-wire system and OBDII. Thats where the hours studying the wiring diagrams come in.
Enjoy and good Luck!

 

[DocZ]

2000 & older Dakota use 2003 Hemi or you will have to get 2001 & newer gauge cluster due to the difference in buss system.
2001 & newer Dakota use 2004 & newer Hemi.
As far as the wiring harness you should use the Hemi engine harness and the Dakota Power Distribution Center (engine compartment fuse box). The 2003 Hemi engine computer and trans computers are separate whereas the 2004 & newer they are combined. I would avoid the 2003 version, if you can, as it isn't supported by DSP tuners. This is only critical if you intend to cam your engine.
Oh ya the wiring. you need to study the wiring diagrams of the Dakota nad the Hemi for hours and hours. If you get the engine harness for a 2004+ Hemi you will find that three out of four 32 wire connectors on the Hemi engine computer for the most part go directly to the engine/trans. You will need to get a 32 wire connector for the fourth connector. This connector is the one you need to splice into the Dakota's engine bay wiring harness, mostly to the PDU and some to the guage cluster, throttle pedal drive-by-wire system and OBDII. Thats where the hours studying the wiring diagrams come in.
Enjoy and good Luck!

On my Dakota (03), the engine and trans computers are combined.

 

[69rrbruce]

On my Dakota (03), the engine and trans computers are combined.

I was talking about the 2003 Hemi:wave:

 

[03DakStampede]

double post

 

[03DakStampede]

I'd like to know if having an 03 dakota would make the swap any easier.
Would it be possible to have the 03 ecm run the engine with tuning? Will the hemi ecu and harnessa swap into an 03 easier than the earlier models?

In short Yes if you have a 4.7 you can swap it out for a hemi change a few connectors and throttle body and tune via SCT. Has it been done Yes and No. There is a guy that says he has done it in a 05 but has not backed up that claim with pictures or video. All the research I have done tells me that in theory it should be 100% doable. Im planning on going this route with my truck but dont have the money as of yet to do it.

NOTE: This would only work with the 2003 or newer trucks as they have a 32 tooth tone wheel and if there is SCT support available.

 

[FastQC4.7]

In short Yes if you have a 4.7 you can swap it out for a hemi change a few connectors and throttle body and tune via SCT. Has it been done Yes and No. There is a guy that says he has done it in a 05 but has not backed up that claim with pictures or video. All the research I have done tells me that in theory it should be 100% doable. Im planning on going this route with my truck but dont have the money as of yet to do it.

NOTE: This would only work with the 2003 or newer trucks as they have a 32 tooth tone wheel and if there is SCT support available.

I have SCT Pro Racer package and use it to tune the 2006 4.7 PCM that is running my moded 2007...5.7 Hemi in my truck. The thing SCOOTS and got better than 18 mpg running to Corpus Christi/Padre Island from Euless, TX this weekend....Cruised 75-85 MPH most of the way too..

http://www.youtube.com/watch?v=HUFeRMCb244

 

[irnwkrkev]

I have a 2002 with the four plug PCM. Is the tone ring still different from a hemi's? Doesn't the Hemi also have dual plugs or am I just thinking of the '08+ 4.7L? I imagine at the minimum it would be less wiring if you have the four plug PCM.

 

[FastQC4.7]

I have a 2002 with the four plug PCM. Is the tone ring still different from a hemi's? Doesn't the Hemi also have dual plugs or am I just thinking of the '08+ 4.7L? I imagine at the minimum it would be less wiring if you have the four plug PCM.

The 02 four plug PCM should be a NGC...NGC has the same tone ring as a 5.7 Hemi.

As long as you have the 2006+ coils or shorty wires you should be fine with the ignition. I honestly don't know what would happen with full length wires and the 4.7 PCM. I don't know if the 4.7 fires the plugs on the exhaust stroke or not. The 5.7 has dual plugs but shares the 4.7s firing order and cylinder layout.

 

[George]

I need help.I have most of my wires hooked up and my motor spins over when I hit the key switch"But I'm not getting any fire and my dash reads"NO BUS". I put a 2004 Hemi in a 2001 Dakota with a 2003 computer and wiring harness.
Thanks..

 

[HemiDak]

I need help.I have most of my wires hooked up and my motor spins over when I hit the key switch"But I'm not getting any fire and my dash reads"NO BUS". I put a 2004 Hemi in a 2001 Dakota with a 2003 computer and wiring harness.
Thanks..

If your odometer and gauges aren't reading anything, then your PCI wire isn't hooked up.

 

[George]

I have SCI,CAN Bus,,But I don't see a PCI in these pinouts I havr of the Hemi wiring which wire is it and what wire does it go to on the truck?

 

[HemiDak]

You do not have a CAN bus system on your truck or the donor PCM. The SCI wires are for communication between a scanner/programmer and the PCM. The PCI wire is labeled as such, and it goes to the PCI wire on your truck.

 

[FastQC4.7]

In short Yes if you have a 4.7 you can swap it out for a hemi change a few connectors and throttle body and tune via SCT. Has it been done Yes and No. There is a guy that says he has done it in a 05 but has not backed up that claim with pictures or video. All the research I have done tells me that in theory it should be 100% doable. Im planning on going this route with my truck but dont have the money as of yet to do it.

I just want to come back and say after running this setup for 2 months now...It is MORE than doable and VERY TUNEABLE.....I put down 285 RWHP and 301 RWTQ in my Ram...2nd gear and HEAVY stock 20s with P305/50/R20s....97*F when it was dyno'd.

http://www.youtube.com/watch?v=dDcPBbeSxTU

 

[George]

I've almost completed my swap / with only a few more wires to figure out.The motor runs perfect but I can't get it to shift gears. I'm sure I'll figure it out.
If I knew what I know about this swap I would have done a lot of things different ,anyone starting a new swap should talk to HemiDak Don't shoot and me first.Then do a lot of research.I'm sure anyone that's ever done a Hemi swap can look back and see something they would have done different..

 

[FastQC4.7]

I've almost completed my swap / with only a few more wires to figure out.The motor runs perfect but I can't get it to shift gears. I'm sure I'll figure it out.
If I knew what I know about this swap I would have done a lot of things different ,anyone starting a new swap should talk to HemiDak Don't shoot and me first.Then do a lot of research.I'm sure anyone that's ever done a Hemi swap can look back and see something they would have done different..

Yea I would have installed my Super Spartan cam from day one.:drive:

 

[Rxrhero]

I'm looking for someone who can do the wiring harness for me. It's a 2004 hemi out of a 2500 4x4. It's going in a 2003 Dakota quad cab 4x4 with a 4.7. I can't find a plug and play harness and I don't have faith in myself to finish this part. Everything else is right on the money. Any help would be greatly appreciated.

 

[TazRango]

A. What's your timeframe?

B. What's your budget/offer for this? This and the timeframe are important, because if you need it back pronto, it's going to cost you more than if it's something I can work on in spare time.

C. Are you prepared to ship me both harnesses and pay for shipping both ways?

D. I'll need high quality/high resolution pictures of the engine bay with the 5.7 installed, along with some indicator of scale (ideally just run a tape measure from the firewall across the top of the engine to the radiator core before you start taking pics). If any sensors or anything are in significantly different places, make sure they are clearly identified on the pics of the new engine. I have a 4.7 in mine so I know where they WERE, I just need to know where they're GOING.

E. Are you going to want the whole thing taken apart, cleaned and re-taped/re-loomed so it looks brand new or are you ok with how it looks now (ie: is the rest of the engine compartment going to be cleaned/painted/dressed up or is this just "make it work")?