In the last year I have become quite addicted to the idea of more horse power and I'm not sure if there will be a limit to this addiction. I'm definitely going to do this, it's just a matter of when at this point. I hummed over super and turbocharging but in the end I decided that my best option, and one that will ensure that I will be able to continue adding power over the following years (due to after market support) is to do a hemi-swap.
This will be a slow build, or rather a build that may not start for some time. I am by no means, an expert. I am certain I will take longer than the builds of others due to lack of funding, experience, and an abundance of procrastination... but once the swap is complete, I will have the beginnings of a hemi powered monster.
This thread will be a place where I will put all the information, links, and anything else I find that is relevant to the swap. I also hope others will add to this thread if they happen to find any infos, or have suggestions for those who want to do the swap. For now, I do have some good infos.
A lot of questions have been asked about how hard it would be to do a hemi swap and all I can say for that is.. it depends. I'm 2wd, so I shouldn't need to modify the oil pan, and it also makes wiring a little easier. The oil pan part is a huge thing, though, for 4wd swappers, it will need to be sectioned and probably have the pickup tube extended.
is the part that most people have been worried about it seems. I don't think it will be that bad actually. A small number of 4.7 to 5.7 swaps have been done and for my model year, the 4.7 PCM will control the Hemi with a tune from hemifever (He says the 5.7 PCM handles fuel deliver better though.) According to what has been done on Dusty05's
swap, it's just a matter of changing most of the connectors on the 4.7 engine harness to the connectors that the 5.7 uses, and extending those that don't reach. I am certain that, with the wiring diagrams, wiring will be fairly easy. Here is his thread on another site.
won't be a problem, the V8 Dakota uses the same transmission that is behind the Hemi, the 545RFE. I may just need a different torque converter I think, which I will be doing anyways since I want a higher stall.
will need to be made. This is a part that I have no confidence in yet and would appreciate any input that anyone has. I have never welded before but I have some friends that can. My plan is to drop the engine in, bolt it to the bellhousing, take some weight off with a jack, and then mock up some mounts with wood or cardboard and make them out of steel. I think I will keep the plate that mounts to the hemi and the plate that mounts to the frame, and do custom from there. Probably solid...
that will stay compatible with the 4.7 computer, there are a few. Not sure which once aren't compatible, but the ones that are have been Ram motors from the 03-06 range with the 8th vin digit being a D (Vin D or EZA.) From what I have gathered, an MDS Vin 2 or EZB motor should work just fine, but MDS won't work without using the whole 5.7 PCM. I'd prefer to stay with a "Vin D" because there are mods made to the "Vin 2" motors that won't be applicable without MDS. Newer motors (09+) with VVT would need the Hemi PCM too, I'm not quite willing to swap out the whole computer just yet, as I am not sure how simple or hard it would be.
I've got more, can't think of it right now. But any input from you guys will be greatly appreciated.
Update section, so people don't have to read the whole thread...
Some conclusions (for now) about the swap.
My truck is an 05 2wd.
My hemi motor is an '06 EZB (MDS) vin-2 motor.
I got a wiring harness from an '05 ram w/o the injector/intake harness attached, supplied 3 of the connectors I needed; crank position, cam position, and alternator sensors.
I was able to get a coolant temp sensor and an oil pressure switch from a 2005 dakota to match up to my original 4.7 harness. The So those 5 things where all that were different. Some items will also need to be extended and relocated within the harness. EGR is in the opposite spot on the 5.7 as it is on the 4.7, but a simple set of blockoff plates and the tune from SCT tuner takes care of that without harness modification. But otherwise you have to splice and lengthen 6 wires.
The 4.7 PCM has limited tuning abilities, so if you want to go ***** to the wall on horsepower, it's a good idea to go stand-alone or undertake the huge project of changing to a 5.7 PCM. I am sticking with the 4.7 PCM for now, we will see how it works out.
You will need rummage radiator hoses to fine a fitting one, the Dakota and Ram hoses don't bend in the right ways. I will update this with more info when I get to that part myself.
A/C lines can be "massaged" to reach.
2wd trucks will need NO oil pan mods with a ram oil pan, this means 4wd models will need small modification.
With a 4wd truck, a simple custom block plate will need to be made for the drivers side. Passenger side motor mount bolts up with a minor modification to the bolt hole. All other parts are 4wd 4.7 engine mount parts. 2wd should switch to 4wd mounts to make things easier.
If you have an 07 Dakota, you will need to swap to 06 or 05 PCM for tuning purposes. Or go full blown hemi PCM swap.