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post #1 of 6 (permalink) Old 07-21-2017, 12:37 PM Thread Starter
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Question Commander engine swap

Is it possible to swap a 3.7 for a magnum 5.2(318), or even better 6.1 hemi. Aside from trans & wiring harness what else would I need to perform either swap? My Commander is a 2010 the heads warped & my extended warranty screwed me. So Im paying for this myself.
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post #2 of 6 (permalink) Old 07-22-2017, 12:51 AM
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Join Date: Oct 2015
Location: East Coast of Florida
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Quote:
Originally Posted by IamSteve Cole View Post
Is it possible to swap a 3.7 for a magnum 5.2(318), or even better 6.1 hemi. Aside from trans & wiring harness what else would I need to perform either swap? My Commander is a 2010 the heads warped & my extended warranty screwed me. So Im paying for this myself.
Steve, welcome to the forum.

Almost anything is possible if you are willing to spend enough money - and that sounds like an expensive project.
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post #3 of 6 (permalink) Old 07-22-2017, 01:02 AM
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Join Date: Jun 2013
Location: California
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I think you'd have a much easier time swapping a 6.1 in, since you'll be able to swap in an ECU from a WK SRT and use engine mounts from a 5.7.

The swap probably won't be easy though. You'll be looking at a new engine, engine mounts, transmission, wiring harness, and ECU. You're also gonna need to swap over almost everything in the engine bay, since almost everything on a Hemi will have to change position from a 3.7.

If you're looking at a 2WD swap, you're probably also gonna want to grab a new driveshaft and regear your rear differential. I believe the 3.7 runs 3.21s, which certainly won't do a Hemi justice.

If you're looking at a 4WD swap, it's going to get very complex. A new transfer case, driveshafts, and regearing on both differentials will be necessary, at the very least.

Realistically, it's probably not worth it. Starting from a 3.7 you've got a lot of work to do, and it'll probably far exceed the cost of just moving up to an XK with a 5.7.
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post #4 of 6 (permalink) Old 07-22-2017, 10:39 AM
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Quote:
Originally Posted by IamSteve Cole View Post
Is it possible to swap a 3.7 for a magnum 5.2(318), or even better 6.1 hemi. Aside from trans & wiring harness what else would I need to perform either swap? My Commander is a 2010 the heads warped & my extended warranty screwed me. So Im paying for this myself.
Will you be doing the work yourself? Or will you be getting screwed by a shop, in addition to getting screwed by the extended warranty?

Anything is possible with enough time, money and skill.

However, swapping a V8 into a Commander that left the factory under V6 power is probably one of the more difficult, time consuming and expensive swaps you can do. As a DIY project, a first timer would basically need a donor V8 commander as the most economical way to get all the parts you need. Since you need the entire driveline (everything is different between the two, engine, transmission, transfer case [if 4wd], final drive[s]), you pretty much need a donor that runs. At that point, the question is why not just drive the V8 one? It's probably cheaper to fix anything wrong with the V8 commander than it is to take everything over to the original V6 commander.

To swap a V8 that didn't come in (many) commanders, you'd really need to start with a V8 commander, too. Putting a 6.1L hemi where the 4.7L V8 used to be is work, but it's feasible. I'm not sure why you'd want to put a Magnum 5.2L in there, but again, swapping that into a V8 commander would also be feasible. I wouldn't do it, even if I had a brand new 5.2L still in the crate, but it's your call. The tough part of that swap would be the electronics and wiring. Commanders never came with 5.2L Magnum engines, and I don't think the Commander ECU would understand a single ignition coil and dizzy. I don't remember the 5.2L or 5.9L Magnum engines ever having coil-over-plug ignition.

If this is a DIY project, or the educational value, consider this plan:
  • Fix the 3.7L engine (optional)
  • Sell the V6 commander
  • Buy a V8 commander. If you want power, get a 5.7L Hemi or if you want a 6.1L Hemi, find a 2006 Commander (SRT?) with the 6.1L or Grand Cherokee SRT
If You really want a DIY engine swap, follow the above, but swap your 6.1L into a V8 (probably 5.7L is best, though 4.7L is possible) Commander.


If you're paying a shop, sell the V6 "as is" and buy a V8 Commander with the engine you want. You wont recoup the shop repair bill when you sell the V6, so don't even try.

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I'm not arguing, I'm just explaining why I'm correct.
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post #5 of 6 (permalink) Old 07-27-2017, 01:50 PM
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Join Date: Jan 2016
Location: Port Orchard, Washington
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So a swap isn't as daunting as you might think depending on the variety. Don't get me wrong, depending on your starting point and the parts you are wanting/willing to buy, the swap can be expensive. I started with a 4.7 and swapped in a 6.1. I also bought a remanufactured 6.1 making it much more expensive (total cost: ~$15k). Starting from a 5.7 would be ideal, but user "Saturate" is the first I know of to do the swap and he started from a 3.7. either one would work, and as a bonus the 3.7 comes with the same transmission found in the SRTs. If you'd like to know the details on my swap search "another SRT swap" either on here or Google, I've got a sort of write up I did. But please don't try the 5.2 because I think it would be a nightmare getting that to work. Also if you're willing to get the engine from a low mileage liftout with all front end accessories instead of a remanufactured engine you'll already have 90% of the parts you need for much cheaper. You'll need exhaust manifolds from a 6.1 GC or custom made ones, no others will work. When you do your power steering pump DON'T BUY A REMANUFACTURED PUMP WITHOUT THE RESERVOIR. But a brand new Jeep GC SRT8 pump with the round reservoir on top is what you want. You will need another ECU and it will need to be tuned. You can either go with a 5.7 Commander ECU with the transmission control turned off or a GC SRT8 ECU. I hope you're serious about the swap I'd love to see another one. Let me know if you have questions.
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post #6 of 6 (permalink) Old 07-27-2017, 01:53 PM
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Join Date: Jan 2016
Location: Port Orchard, Washington
Own a Commander?: Yes
Model year: 2008
Trim Package: Sport
Power-Train: 4.7L V-8
2WD
If 4WD - system: QT-I
Current Mileage: 3500
Posts: 359
Garage
Now that I think about it you have a 2010 the 5.7 ECUs are capable of VVT, you COULD go with the stock 392 SRT, but I'm not 100%.
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