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5.7 car motor into 05 cherokee help...

5K views 24 replies 16 participants last post by  anyoldiron 
#1 ·
I have a 2005 Jeep grand Cherokee with a 4.7 engine...I have a 2008 dodge magnum 5.7 that I wanna use in the Jeep....will this work? All parts are available for me to use...has anyone used a car motor as a swap? What problems would I have? I wanna use motor and tranny if possible....
 
#2 ·
ypu will need to deal with the electronics.

either getting jeep 4.7 harness to work with your car stuff.

or making your car stuff work in the jeep.






or find a 5.7 jeep to get the electronics from...am talking PCM and all associated modules and parts.












basically a huge can of worms. can bus will do that to you.
 
#3 ·
Although I can't speak directly to the swap you are describing, I think most people determine that full powertrain swaps like that are more hassle than they are worth. The electronics on these things are pretty complicated, and there are many chances for things to go wrong!


Plus, I do not believe the Dodge Magnum used the 545rfe (perhaps the W5A580?) tranny found in the V8 Jeeps, so you may have some problems there as well. The 4.7L jeep does have the right transmission, but I do not know what would be required to make it work with the Hemi motor out of the Magnum.



Why not just sell the Jeep and Magnum, and use that cash to buy a Hemi Jeep?
 
#6 ·
You are going to run into a lot of issues, but it can be done, but doing this just for a 5.7 isn't worth it.

Sell both and buy yourself what you want and mod from there.

The electronics and body modules are going to give you a severe case of Teretts!
 
#10 ·
Its possible but so is a 6.1 in a liberty. You will need the computers, mounts, etc from a hemi jeep. So three vehicles to make one? You might be better off looking for a 2008 or newer 4.7. Now that is more likely to "click right in."

168,000 on a 4.7 now thats good news for some of us!!
 
#12 ·
So you want to take a setup that works and torment yourself with what will likely be an endless series of hassles? Radiator, AC, front suspension, mounts, drivetrain, and a lot of electronics changes, are but the start of the effort.

Just rebuild the 4.7 or buy a Jeep that already has the 5.7L. Seriously. You already know how the 4.7 serves your needs. Why change that to living with a Frankenstein that nobody will be able to diagnose or service?

I'm all for challenges but the added parts costs and labor issues here don't make a lot of sense.
 
#13 ·
It'll be a big headache, and not really worth it if you ask me. The magnums used the NAG1 trans. Oil pan and oil pickup is different between the 5.7 in the car and the 5.7 in the Jeep. Plus all the electronics and everything else, huge can of worms but sure it can be done.
 
#19 ·
While I can't speak to the complete swap, as said above, I am sure it would be an ongoing PITA. I also own a Hemi Maggie and a Hemi WK and, just off the top of my head I can tell you some of the differences. The Hemi Maggie uses the NAG1 trans. so you'll have to stick to the 545RFE unless you install the WK SRT NAG1 and (probably) transfer case. The TCM for the Maggie is a separate unit (under the dash by the steering column) and the WK's TCM is built into the PCM. I think someone mentioned using the 4.7 PCM, but the 4.7 doesn't have MDS, so this may not work. The oil pans are different (because of the 4WD, unless you have an AWD Maggie), so you'd have to get a 5.7 WK oil pan. The wiring harnesses and power distribution boxes are located in different places....Maggie has one in the spare tire well in the rear by the battery, and one on the front passenger side in the engine compartment. The WK has both up front on the driver's side. Don't know if/how this would impact anything, but for sure would be one of the biggest challenges to figure out. Hope you're good at chasing the FSM wiring diagrams for both vehicles. They'll make your head spin, just figuring out how everything is intertwined. I am sure there are many other things to consider, but I know I wouldn't want to tackle it. If it were just an engine swap between a 5.7 WK and a 5.7 Maggie, I'd say, not too big a deal. All I can say is, good luck if you decide to take this one on.
 
#21 ·
I'd agree with the "no go". The exhaust would also have to be completely redone, as the manifolds are different, as is everything from there back. Why don't you want to keep the Maggie? I love mine. What kind of stuff (accessories/add-ons) is on yours? Are you planning to part it out?
 
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