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  #1  
Old 04-13-2011, 07:15 PM
Sureshot3592 Sureshot3592 is offline
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2004 4.7 to 5.7 HEMI swap

I have a 2004 4.7l dodge dakota. im looking to put a 5.7l hemi in it. the only thing stopping me right now is wiring. does anyone know if they make a wiring harness that would plug from the 5.7 hemi and computer right into the fire wall so i don't have to change the entire wiring harness under the dash. any suggestions?
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  #2  
Old 04-14-2011, 12:17 AM
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No matter what you don't have to change the wiring harness under the dash. Just the harness between the power distribution unit and the engine control unit. I'm not aware of any prebuilt plug & play harness, however, I'm sure you could find people to build a custom harness,if you can afford it. If you have some knowledge of automotive wiring / system and can read wiring diagrams and pin-outs you can do it yourself. It just takes a lot of time comparing the host vs. donor electrical systems.
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1998 Dakota - - 5.7 Hemi - RCC#115 - 6.1 Cam, pushrods & springs, DS Predator 91 tune, LX intake manifold, aluminum fuel rails, 2006+ coils & valve covers, SST dual exhaust, Magnaflow muffler & Pypes tips, 545RFE w/ Sonnax line pressure booster, Lokar floor shifter, 9.25 diff w/ Powertrax Lock-rite locker, Dynamic Grounding system,Viper electric fan, custom aluminum fan shroud & CAI, hood nosed, tailgate and fenders shaved, Sir Michaels rollpan.
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Old 04-14-2011, 02:24 AM
Sureshot3592 Sureshot3592 is offline
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okay so basically snip the plug going into the fuse block off the 4.7 harness and soder it onto the 5.7 hemi harness and plug it in?
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Old 04-14-2011, 04:10 AM
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LOL.......no it's not that easy! As I said you have to compare wiring diagrams. Connect wire with same function from 5.7 to wire with same function from 4.7.
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1998 Dakota - - 5.7 Hemi - RCC#115 - 6.1 Cam, pushrods & springs, DS Predator 91 tune, LX intake manifold, aluminum fuel rails, 2006+ coils & valve covers, SST dual exhaust, Magnaflow muffler & Pypes tips, 545RFE w/ Sonnax line pressure booster, Lokar floor shifter, 9.25 diff w/ Powertrax Lock-rite locker, Dynamic Grounding system,Viper electric fan, custom aluminum fan shroud & CAI, hood nosed, tailgate and fenders shaved, Sir Michaels rollpan.
My Hemi build thread
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Old 04-14-2011, 04:39 AM
Sureshot3592 Sureshot3592 is offline
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hahaha i understand watcha mean by its guna take some time but after i compare the two and figure out what goes where it should be just soder and plug right?
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Old 04-14-2011, 07:20 AM
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2003-2007 you won't have to rewire the truck but you will need to change some connecters and possibly extend some leads. What you will need is the mopar performance cable throttle body, a data logger, sct tuner, a couple connector, and some fabrication skills for the oil pan and engine mounts. Both the 4.7 and 5.7 share how they pick up the information for timing etc and some 4.7 sensors can be used in place of the 5.7 ones. The only thing is you want to use a 5.7 from a ram as they will not require an intake swap and front accessory cover swap. I would highly recomend getting on some of the hemi ram forums before considering this swap and learning some about the enigne and what is available for it.

Last edited by 03DakStampede; 04-14-2011 at 07:26 AM.
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Old 04-14-2011, 02:32 PM
Sureshot3592 Sureshot3592 is offline
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what i was thinking was change that plug on the new harness, put in a new motor, ecu, and harness as wall as get a new gas pedal that will work with the electronic throttle body. i already have a flashpaq tuner. i know the HEMI is alot more customizable than my 4.7 now. and i know how to weld and fab. thats no problem
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Old 04-14-2011, 02:50 PM
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But that's just it you don't need the drive by wire system. All youll have to do is have the 4.7's computer Customed tuned to run the hemi a flashpaq will not work. That is what the SCT is for the data logger is used to help the tuner dial it in. What I posted in my previous post is alot easier then rewiring the vehicle.
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Old 04-14-2011, 03:06 PM
Sureshot3592 Sureshot3592 is offline
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a new cable operated throttle body is pretty pricy. i think it would just be cheaper to get the new pedal. right? if i wanted to use the 4.7 computer how would the 5.7 harness fit onto that. its not the same plug. id think it would just be easier to use the 5.7 harness and ecu and just change that one plug going to the fuse block.
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Old 04-14-2011, 03:22 PM
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There's alot more to it then that. You would have to verify and repin the other conectors that are already in the vehicle. I have not done much research on this to know what all will change there. There is a guy on eBay that sells adapter that would go to a gm tb that you could pick up from a junk yard.
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Old 04-14-2011, 06:01 PM
Villa364777 Villa364777 is offline
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Im not going to lie to you this swap isn't so easy you can have it done in a day. With the right tools and some help I have no doubt someone can do it in a week. I see what your talking about with the act tune and all but that just sounds pricey... For the throttle I just used the Apps box because I don't have the skills or supplies to make a bracket for the pedal, I have both by the way so if you want a pedal hit me up and ill give it to you with the connector plug for the price of shipping
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Old 04-14-2011, 06:14 PM
Villa364777 Villa364777 is offline
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I used a 2003 engine, transmission, harness and computer with 16000 miles that I got for $2900. The connectors you will splice into on a 2001 truck are the two in the fuse box and the c3 PCM connector. The hardest part for me was not knowing very much on how to remove an engine.
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Old 04-14-2011, 06:16 PM
Villa364777 Villa364777 is offline
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For the splices I used the 3m heat shrink butt connectors. Don't get the ones at autozone they are cheap.
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Old 04-14-2011, 07:49 PM
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If you decide to do it the way villa did I would recomend going with a 2005 hemi and computer. There are better tuning options for the 05 and newer rams then the 03's. The 03's are the basterd child when it comes to tuning. I only recomend that incase you decide down the road to change the cam and get alittle crazy with the engine.
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Old 04-14-2011, 08:04 PM
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Quote:
Originally Posted by 03DakStampede View Post
But that's just it you don't need the drive by wire system. All youll have to do is have the 4.7's computer Customed tuned to run the hemi a flashpaq will not work. That is what the SCT is for the data logger is used to help the tuner dial it in. What I posted in my previous post is alot easier then rewiring the vehicle.
if you were to do it that way would your cruise control still work i've seen on a few threads that you loose it when you swap to a hemi
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