Officially works: 6.4 SRT in a WJ - JeepForum.com
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post #1 of 57 Old 09-12-2017, 06:05 PM Thread Starter
ilikejeepssrt8
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Officially works: 6.4 SRT in a WJ

Ok so to start off, it is not completely done (projects never are) nor is it perfect. But I can say that I have a 2001 WJ that runs and drives powered by a 2015 srt 6.4
I have researched the topic for a long time (hemi vs WJ) and I had the right jeep at the right time come up so I decided to go for it.

It started out life as a 4.7L limited. With the select track transfer case and the 44 limited slip rear end. (3.73 I think they are all that ratio) 545rfe trans.

Steps taken:
Remove old engine

Service all remaining parts of the drivetrain (all seemed in good shape)

Figure out if it even fit (it does basically same dimensions as a 4.7

Bolt to original trans, Center and angle combo to achieve proper working angles on u joints

Fab and mount new engine mounts

Cut, notch, and box in rs frame to fit alt

Fabricated new exhaust

Removed all mocked up parts fully welded and painted

Wired new engine and installed

Installed electric fans with stand a lone controller to original rad

Installed remote filter mount to clear steering and track bar.

Hardships:
Engine mounts. Bought universal hemi mount kit from trans dapt and proceeded to cut them up untill they would work. Also needed to make intermediate plates. Drivers side mount went forward and passenger side went backwards.

Exhaust. Obviously no one makes headers or an exhaust kit for it so I bought a set of shorty headers for a gen 1 hemi and.... proceeded to cut them up u till they worked. Flange from the new hemi manifolds. Changed primary tube angle, oh and for the drivers side I had to cut the whole thing apart and change it's angle to get around the front diff. Then the rest was a cheap do it yourself 3" summit kit with a magnaflow muffler.

Electrical harness: well this wasn't really a hardship. A company called HOTWIRE AUTO. Called them. I have this engine and I'm putting it in this. Done

Oil pan: engine was from a challenger and had a front sump. Got a pan and oil pick up from a 14 ram with a 6.4

Cost:
6.4 on eBay $3600
Jeep $200
Complete harness $1000
Computer tuning $500
Rad fan set up $500
Those are the big ones. Other misc stuff was easily another 1500.

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post #2 of 57 Old 09-12-2017, 06:12 PM Thread Starter
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post #3 of 57 Old 09-12-2017, 06:17 PM Thread Starter
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post #4 of 57 Old 09-12-2017, 06:22 PM Thread Starter
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post #5 of 57 Old 09-12-2017, 06:25 PM Thread Starter
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post #6 of 57 Old 09-12-2017, 06:28 PM Thread Starter
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That's it that's all additional info to anyone wanting to know more info apon request
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post #7 of 57 Old 09-13-2017, 03:54 AM
Grippy0
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Top work mate, this will give the wj a good kick in the guts
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post #8 of 57 Old 09-13-2017, 10:28 AM
tymaoaretae
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That is awesome. I always hoped someone would succeed with this and it wouldn't be as bad or expensive as everyone speculated. Nice job.

And your cost is close enough to a remanufactured 4.7 that I'd consider this if mine kicked the bucket.

2003 WJ LTD 4.7, 242HD, PR44+ARB+RCV & D44HD+varilok+BTF 4.56, 7" RC LA (Clayton coils + pucks), Bilstein 5165, OBA, Lizardskined & Monstalined inside.
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post #9 of 57 Old 09-13-2017, 10:32 AM Thread Starter
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I mean I lucked out with finding that 6.4 I can see it being alot more money and time consuming to get one.
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post #10 of 57 Old 09-13-2017, 10:43 AM
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Any videos of it running and driving around?


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post #11 of 57 Old 09-13-2017, 11:00 AM Thread Starter
ilikejeepssrt8
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I do have videos of it running but it won't upload. Or maybe I just don't know the right way to do it. As for driving around I am waiting on a new set of springs for the front end so the axle is on the ground right now
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post #12 of 57 Old 09-13-2017, 11:33 AM
tybarious
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Might try uploading to youtube and posting a link.


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post #13 of 57 Old 09-13-2017, 01:02 PM
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Quote:
Originally Posted by tymaoaretae View Post
That is awesome. I always hoped someone would succeed with this and it wouldn't be as bad or expensive as everyone speculated. Nice job.

And your cost is close enough to a remanufactured 4.7 that I'd consider this if mine kicked the bucket.
Quote:
Originally Posted by ilikejeepssrt8 View Post
I mean I lucked out with finding that 6.4 I can see it being alot more money and time consuming to get one.

The biggest thing I'm excited about is that it fits without a ton of modification to the WJ chassis and is a viable swap.

The 5.7/6.1/6.4 are all dimensionally the same, I can see the 5.7 being a perfectly budget friendly swap compared to a quality reman'd 4.7. The 5.7 can be had for significantly cheaper than the 6.1 or 6.4 motors, although they're not as cheap as an LS 4.8/5.3/6.0, this certainly shows that you can upgrade the WJ powertrain significantly and keep it Mopar at the same time.

There's several listings on Ebay for low mileage (under 50K) 5.7 truck motors for $2500 or less and some with free shipping.

I will certainly be considering a 5.7 swap when my 4.7 finally kicks the bucket or when I can find a screaming deal on a good 5.7 donor (think $1k or less) to swap in.

@ilikejeepssrt8

I'm assuming you left the BCM in place? Aside from the gauges, what doesn't work on the interior, if anything?

What about the SKIM and new PCM? What was needed to make them cooperate or did you have the SKIM flashed out of the 6.4 PCM?

The earlier WJ 545RFE uses a standalone TCM, did you retain that or is TCM function now handled by the 6.4 PCM?

I'm assuming the 545RFE bolted right up to the 6.4, but I'm willing to bet you could swap in a newer 65RFE behind a 5.7 truck motor and have a 6 speed auto.

EDIT:

Any bets on when the first Hellcat swap happens?

Gone:
'00 Limited
'03 Laredo

Current

'14 Overland EcoDiesel


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post #14 of 57 Old 09-13-2017, 01:13 PM Thread Starter
ilikejeepssrt8
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BCM was left alone and everything still works as it should

Trans cal is in the new PCM
Wiring harness was made for my swap so it was all plug and play

All the security controls had to be flashed out

The new PCM I got from a junk yard from an 09 hemi ram
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post #15 of 57 Old 09-13-2017, 01:14 PM Thread Starter
ilikejeepssrt8
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Yes it bolts right up. Reused the torque and flex plate
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