2003 to 2005 PCM Swap - Hemi Truck Club
 
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Old 08-17-2015, 07:42 PM   #1
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2003 to 2005 PCM Swap

Hi all,

First time posting but long time enthusiast on the hemi. I have myself a 2003 Dodge Ram 1500 2wd with the 5.7L that I am coining "project race truck." I dropped in a comp cam 260 with new lifters, 6.1L valve train, and the bottom end has been rebuilt (after a stock valve spring broke on the stock motor and dropped a valve). I have also done longtubes, true CAI routed to the existing AC fan shroud (AC deleted), 180 Tstat, and is currently running on a superchips 91 tune. Problem is, well it doesn't run that great. The truck weighs with me in it 5360 pounds and I am currently running 15.5 in the 1/4 mile @ 91.7 mph. The trap speed is decent but not lining up with the ET, and I think there is much room to be made with custom tuning.

Now for the 03 issue. I know custom tuning is limited so I bought myself an 05 hemi parts truck (500 bucks complete with motor and trans!) that a buddy and I tore out every electrical harness and module out of. I am planning on doing a full swap to 05 electricals, or at least what we find needed. I have heard of some people doing this with some parts from an 05 (engine harness, PCM, maybe front harness with fuse box?) but I haven't seen it documented well. I plan on documenting every single module and harness in this thread that MUST be used from the 05 in order to convert via plug and play an 03 to 05 for custom tuning purposes.

Some issues that I know of just from pulling out the 05 harnesses:
- abs modules look different
- you need the SKIM from the donor truck to communicate with the PCM. Hence you also need the donor keys and ignition cylinder
-05 has a different gas pedal
- instrument cluster connections are different. This is where I don't see how people have done this without the full cab/dash wiring harness, which connects to the PCM, engine harness, fuse box, fcm and abs module. I have access to reflashing the PCM/cluster to show my current mileage.
-05 has egr and 4 o2s. I would like custom tuning done to delete egr but plan on using 4 o2s like factory (03 only has 2)

I have a wideband O2 sensor which is showing decent A/F at WOT but I really think it needs some tuning down low. I was told that a guy on this forum writes custom tunes, but I may consider local unless someone instructs me what I need to do to get custom tuning done over the web?

My buddy has a Paxton supercharger that I may be installing on this motor in the future. Heres to the beginning of a long but powerful road ahead

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Old 08-17-2015, 08:02 PM   #2
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Welcome to HTC.
Looking forward to your progress.
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Old 08-17-2015, 08:51 PM   #3
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Welcome. I just had an '04 swapped to '05. We are still tuning the truck. However, I'm not a mechanic nor am I an electrical specialist. I can tell you from one enthusiast to another, your heading in the right direction for tuning possibilities especially if drag racing is what you have your heart set on. BTW, if you don't install the blower, will you spray the truck?

Good luck!
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Old 08-17-2015, 08:57 PM   #4
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Old 08-17-2015, 09:30 PM   #5
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Quote:
Originally Posted by BottleFedHemi View Post
Welcome. I just had an '04 swapped to '05. We are still tuning the truck. However, I'm not a mechanic nor am I an electrical specialist. I can tell you from one enthusiast to another, your heading in the right direction for tuning possibilities especially if drag racing is what you have your heart set on. BTW, if you don't install the blower, will you spray the truck?

Good luck!
Hey what did you have done to convert yours over? Did you have Hotwireauto make you a harness or do the swap yourself? Interested since this is the first I have heard of someone actually completing it with results
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Old 08-18-2015, 05:56 AM   #6
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Old 08-18-2015, 05:57 AM   #7
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Welcome to HTC GreenEH.

Good luck on your 03 to a 05 pc swap. Looking forward to your race truck project.
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Old 08-18-2015, 07:29 AM   #8
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Quote:
Originally Posted by GreenEH View Post
Hey what did you have done to convert yours over? Did you have Hotwireauto make you a harness or do the swap yourself? Interested since this is the first I have heard of someone actually completing it with results
It's a late '04 so I don't have a separate TCM. Still, No one was able to tune for any shift points, etc. So I sent it to hotwire and Chris gutted it as an '05 and flashed it for my vin. My local late model speed shop did the swap and sent everything off. It's on the dyno today...
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Old 08-18-2015, 07:30 AM   #9
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Welcome, Always glad to see another 03 join the herd. I would suggest you talk with Hotwire and see if they can make you the harness to simply plug the 05 PCM in. You will probably need to supply them with both harnesses from the PCM's. No doubt you will need to add a O2s bung. The egr I believe can be deleted in the 05 tune when you have it done. Talk to Keith (CMR Tuner) about what can be done. Good luck.
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Old 08-18-2015, 09:46 AM   #10
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