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  #1  
Old 04-06-2016, 07:00 PM
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Engine swap

Hi, I have a WK2 5.7L, and I was thinking of doing a possible engine swap if able. Has anyone ever done or heard of a working 6.4L swap? If so, is it straight drop and bolt, does the connectors fit the between both? I tried to search, but couldn't find much info on it.

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Old 04-07-2016, 01:01 PM
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Re: Engine swap

just throw a supercharger on that thing and call it a day if you're just looking for more power..and you'll outperform a 6.4L in stock form
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Old 04-08-2016, 04:02 PM
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Re: Engine swap

I've seen 6.4L engines go for what I would be spending on a good supercharger kit.
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Old 04-08-2016, 07:58 PM
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Re: Engine swap

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Originally Posted by TopSpeed View Post
I've seen 6.4L engines go for what I would be spending on a good supercharger kit.
Unless you're getting the 6.4 from a junkyard and it comes with the computer, I imagine a new computer to run the 6.4 would be kind of pricey.
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Old 04-08-2016, 10:20 PM
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Re: Engine swap

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Originally Posted by BobsWK2 View Post
Unless you're getting the 6.4 from a junkyard and it comes with the computer, I imagine a new computer to run the 6.4 would be kind of pricey.
Exactly ..I looked into swapping a 6.4l into my jeep and when you really look at all that's involved you either upgrade your existing motor or trade in the vehicle and buy an srt

All the ecu stuff is different ..I'm not sure the tranny is a direct bolt up either?
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Old 04-09-2016, 03:54 AM
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Re: Engine swap

I,ve been told that swap from 5.7 to 6.4 is just bolt on. What you need then that is custom tune of your ECU or flash engine software from 6.4.
Do not touch TCM as the transmissions are different. I guess that Sean from hemifever could solve issue with tune.
But engine should be in full set with injectors, intake, etc. You also need to care about exhaust as 6.4 has different. You will definitely need srt headers and cats and might be cat back srt exhaust as its also based on larger tubes than 5.7.
But note that at the end you will never reach close to srt dynamics having 5.7 6RFE trans and 5.7 differentials ratios. If you already have MY14 hemi with 8HP transmission then engine swap or any modification like charger or stroker kit makes more sense.
I believe that for older wk2 5.7 with 6RFE trans there is no sense to touch engine at all.


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Old 04-09-2016, 08:42 PM
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Re: Engine swap

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Originally Posted by AlexIVK View Post
I,ve been told that swap from 5.7 to 6.4 is just bolt on. What you need then that is custom tune of your ECU or flash engine software from 6.4.
Do not touch TCM as the transmissions are different. I guess that Sean from hemifever could solve issue with tune.
But engine should be in full set with injectors, intake, etc. You also need to care about exhaust as 6.4 has different. You will definitely need srt headers and cats and might be cat back srt exhaust as its also based on larger tubes than 5.7.
But note that at the end you will never reach close to srt dynamics having 5.7 6RFE trans and 5.7 differentials ratios. If you already have MY14 hemi with 8HP transmission then engine swap or any modification like charger or stroker kit makes more sense.
I believe that for older wk2 5.7 with 6RFE trans there is no sense to touch engine at all.


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I'm thinking about getting a MY14 or MY15 and doing that engine swap. I just want to get as much info about the swap as possible before I proceed.
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Old 04-10-2016, 03:54 PM
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Engine swap

Raise your hands, how many people here have done an actual engine swap, ever.
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Old 04-10-2016, 04:28 PM
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Re: Engine swap

I personally know man who did swap of his 5.7 engine block to 6.4 to have 7.0 stroker at the end. So at least one. It was MY12.


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Old 04-13-2016, 05:57 PM
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Re: Engine swap

OK, I'll bite.

Let's ASSUME it's a bolt in deal. By the time you pay for the 6.4 engine, and factor in the depreciation you'll add to the new Franken-mobile... not to mention the labor pains of getting all the electronics worked out or labor costs if need, and certainly your time... you will have spent at minimum SAME money as if you'd just traded for a new SRT.

Why go through all of that... and have a half-assed, pseudo-SRT when you could have a real SRT for same/less money.

Personally, a 5.7 Hemi WK2 is a pretty damn good SUV. Operative word ESS - YU - VEE.

If you want a sports car take the $$ you have squirreled away for engine swap and find a nice used Honda S2000. Just as quick, and a helluva lot more fun on a track.
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Old 04-13-2016, 07:33 PM
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Re: Engine swap

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Originally Posted by Nonstop View Post
Raise your hands, how many people here have done an actual engine swap, ever.
I've done it (not in a GC but twice in chevy trucks). What I will say is that it always costs way way more than you would think. It starts out as engine + a few extras, and the further you get into it the more you spend: if you got everything apart you might as well do a new water pump, ditto for ujoints, or my personal favorite - new engine (which on paper is fine with tranny) nukes tranny that is a little tired. There are a 100 little things that you don't think of up front that come up.

In this case I think you would end up being cheaper to just buy an SRT (not even counting in labor).
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Old 04-14-2016, 05:09 AM
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Re: Engine swap

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Originally Posted by Blkfenders View Post
OK, I'll bite.

Let's ASSUME it's a bolt in deal. By the time you pay for the 6.4 engine, and factor in the depreciation you'll add to the new Franken-mobile... not to mention the labor pains of getting all the electronics worked out or labor costs if need, and certainly your time... you will have spent at minimum SAME money as if you'd just traded for a new SRT.

Why go through all of that... and have a half-assed, pseudo-SRT when you could have a real SRT for same/less money.

Personally, a 5.7 Hemi WK2 is a pretty damn good SUV. Operative word ESS - YU - VEE.

If you want a sports car take the $$ you have squirreled away for engine swap and find a nice used Honda S2000. Just as quick, and a helluva lot more fun on a track.
I recently spoke to someone from JeepAreUs, as they carry the 392 hemi engine for around $7.5k, and I was told that it was a direct drop, with a computer reflash. To make things easier, I priced out a MY16 5.7L loaded, and a MY16 SRT, and the difference was roughly $18k more for the SRT. Now if I was able to just switch out the engine, that would be a 10k difference to do other things with. I'm not worried about the labor to do the swap, I'm merely concerned with how possible it is and if someone had done it successfully.
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