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Unread 06-25-2013, 12:19 AM   #1
dodgethejeep
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jk motor upgrade ideas?

I know there are superchargers and hemi swaps available for jks. Has any one ever swapped in a chev 350 or mopar 4.7? The way i understand it would require transplanting the entire vehicle wire harness and computer bumper to bumper. Along with the drive train. Can anyone elaberate on this idea? This is an idea only right now. Maybe down the road i can find a grand cherokee to use for said swap but i'm looking for good suggestions to start basing research on. I don't like how the can bus system restricts options and want a simpler system.

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Unread 07-04-2013, 10:12 PM   #2
RockyClymer
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Not sure if you would plan or registering the modified vehicle or how...most states do not allow you to install an engine from an older model and register it. I am sure others will chime in here with similar versions on this.
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Unread 07-05-2013, 12:44 PM   #3
joe108
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How about a re-gear to get you a little more power? It would be less work and it may be enough that you may like it.
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Unread 07-05-2013, 02:24 PM   #4
wendell
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How about 4.0 like it should already have he he.
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Unread 07-05-2013, 09:24 PM   #5
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*edit* nvm
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Unread 07-05-2013, 09:56 PM   #6
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The 3.8l v6 is a great PROVEN dependable Chrysler engine-


QUOTE=joe108;15643760]How about a re-gear to get you a little more power? It would be less work and it may be enough that you may like it.[/QUOTE]

BINGO-good call joe-

The only drawback to useable power/torque since 2007, is the gearing used in the different model differentials-

When you regear to the proper gears, the JK/JKU can/will come alive, with better gas mileage as a bonus !

Tried and proved-

Checkitout

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Unread 07-05-2013, 11:26 PM   #7
dodgethejeep
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Had to regear my last jeep so i know that works well. Just wish these things had a v8 option from factory.
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Unread 07-06-2013, 07:36 AM   #8
SunDevilJeeper
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Quote:
Originally Posted by dodgethejeep View Post
Had to regear my last jeep so i know that works well. Just wish these things had a v8 option from factory.
They should have been doing that since the YJ, but no... let's not give the Mopar fans what they want. I'd buy a JK or JKU if they made it with a Hemi option. Call it an R/T even, I don't give a ****.
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Unread 07-06-2013, 10:50 PM   #9
222Doc
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Well the latest motor has about v8 power now. Its more power than the old V8's Jeep ever used. If and I hope not to soon anyway this 3.6 goes south. I would be leaning more to the Ls swaps. Where I live I could drop in any motor I want. But I would not drop in any iron block to much weight.
The 2d with 4:10 on 32"s auto is fairly quick. Off the line less than half pedal would make the tires scream. Heck it still can with 35"s.
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Unread 07-06-2013, 11:21 PM   #10
SunDevilJeeper
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Quote:
Originally Posted by 222Doc View Post
Well the latest motor has about v8 power now. Its more power than the old V8's Jeep ever used. If and I hope not to soon anyway this 3.6 goes south. I would be leaning more to the Ls swaps. Where I live I could drop in any motor I want. But I would not drop in any iron block to much weight.
The 2d with 4:10 on 32"s auto is fairly quick. Off the line less than half pedal would make the tires scream. Heck it still can with 35"s.
Take the top and doors off a 13 Rubi, that thing seriously gets up. But it's just not the same, the Hemi V8s made today are making a lot more power than the V8s of a couple decades ago.

Mopar has always been about stuffing the biggest, most powerful engine in the lightest, or smallest vehicle they could find. Then adding a little more power to that engine, and making it a scary *** machine that gives you thrills. Putting a V8 into a Wrangler seems right up Mopar's alley.
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Unread 07-07-2013, 12:26 AM   #11
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I would love a hemi in mine, but they would have a ton of troubles with safety rating putting one in off the bat. A ton of the vehicle would have to change to make it handle/stop safely from a potentially much higher speed. Not saying people would go crazy if they had the big engine, but that is what needs to be designed for. That's why I would never expect to see a Hemi Wrangler, still can dream though!
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Unread 07-07-2013, 02:04 AM   #12
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You do kinda have a point there. Safety regulations have changed a lot over the years, kinda sucks for some of us.

If I could have it my way, JKUR with a 6.1L Hemi under the hood, manual transmission, put it on 37s with some 5.38s and I'm a happy camper out in the desert.


You have any idea how beefy my suspension would have to be?

EDIT: Nothing wrong with a 392 Hemi either, just sayin...
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Unread 07-07-2013, 09:14 AM   #13
dodgethejeep
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Not saying i need a hemi but a 4.7 with some balls would be nice. Got it that old motors in newer jeep = bad idea. Takes alot of road to top out the speedo on a jku. The hood and 3 piece top start ratling at 95. I don't need to go 100+ but more power below that i do want bad. I will have to wait till i get state side to do something worth while but even my wife agrees her jeep needs more power. Supercharger looks to be the cheaper option but a flex fuel v8 out of a newer cherokee looks good. Anyone done this?
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Unread 07-07-2013, 09:29 AM   #14
JIMBOX
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NOPE, cheapest NON-WARRANTY-jeopardizing mod is REGEAR


Quote:
Originally Posted by dodgethejeep View Post
Not saying i need a hemi but a 4.7 with some balls would be nice. Got it that old motors in newer jeep = bad idea. Takes alot of road to top out the speedo on a jku. The hood and 3 piece top start ratling at 95. I don't need to go 100+ but more power below that i do want bad. I will have to wait till i get state side to do something worth while but even my wife agrees her jeep needs more power. Supercharger looks to be the cheaper option but a flex fuel v8 out of a newer cherokee looks good. Anyone done this?
Usually below $2000 bucks for a 15/25% increase in APPLIED HP-Torque

You just have to pick the ratio that'll be best for you-

Wonderful results/w better mpg and response/w no reliability/ECU/aftermkt troubles--

Checkitout

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Unread 07-07-2013, 12:38 PM   #15
dodgethejeep
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Plan on regearing to 4.10 either way just courious if some one had done a motor swap with the can bus system using something other than hemi or ls. Heard bout a swap out of a commander but i thing that was a 5.? Hemi? Honestly just want a small 8 but that might be a dream to let die.
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