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Unread 02-20-2013, 03:08 PM   #1
RobSheaTJ
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2004 TJ Wrangler 
 
Join Date: Dec 2010
Location: Medford, MA
Posts: 295
2004 TJ 2.4 to 4.0 swap

Most of my mods up to this point have been pretty tame, the biggest one being a 3" lift. So I'm a bit of a newbie.

I love my Jeep but hate it's engine. Putting a 4.0 I6 in it would be amazing. I've been trying to do some research on it and thought it would be one of those threads that gets dredged up every few weeks or so but can't seem to find a single one.

Does anyone have any experience with this swap? Is it the most compatible engine in regards to transfer case and transmission issues? What other sorts of issues can I expect? Any other suggestions would be very much appreciated.

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Unread 02-20-2013, 03:18 PM   #2
Luke95
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1998 XJ Cherokee 
 
Join Date: Jun 2012
Location: Plymouth, CT
Posts: 3,559
Dude
Srt4 swap :P

Biggest issue I see is emissions.

Sent from my black box in my silver pos box
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Unread 02-22-2013, 07:17 AM   #3
-jb-
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2001 TJ Wrangler 
 
Join Date: Jul 2008
Location: 540 of VA
Posts: 817
Quote:
Originally Posted by RobSheaTJ View Post
Most of my mods up to this point have been pretty tame, the biggest one being a 3" lift. So I'm a bit of a newbie.

I love my Jeep but hate it's engine. Putting a 4.0 I6 in it would be amazing. I've been trying to do some research on it and thought it would be one of those threads that gets dredged up every few weeks or so but can't seem to find a single one.

Does anyone have any experience with this swap? Is it the most compatible engine in regards to transfer case and transmission issues? What other sorts of issues can I expect? Any other suggestions would be very much appreciated.
It's really not that hard. But depending on your local laws it maybe a littler harder finding a 04-06 swap to put back in the same year or new motor.

Your PCM and dash is PCI so you want a motor from a 01-06 Wrangler. It'll make it easier on you since the harness and pcm will work with your gauges. You'll have to move your motor mounts. If I was you I'd find a donor vehicle so all your parts are there.

You maybe able to get away with using your engine harness, comparing it's pinouts to those of the PCM for the new motor and adding the extra injectors that you need.

Although if you are going to go for this much work just for the 4.0 most will say including me to go bigger than a 4.0. They are great motors but leave a lot to be desired

Also you'll want to swap in the trans from the 4.0 and if you can grab the tcase, it'll help in the long run.
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Unread 02-22-2013, 04:55 PM   #4
RobSheaTJ
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Quote:
Originally Posted by -jb- View Post
You'll have to move your motor mounts. If I was you I'd find a donor vehicle so all your parts are there.
I'll have to replace the motor mounts but the tabs on the frame can stay in the same spot right? No cutting and welding?
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Unread 02-22-2013, 07:52 PM   #5
-jb-
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No you have to move the frame mounts. Why most people go a v8 swap because it's the same amount of work for the 4.0 or V8
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01 TJ, HP 30/Locked, dana44/locked, 4.88's, 4in ProComp Springs, JKS 1.25 bl, JKS Trackbar, Currie Arms, RS9000XL shocks, 35x12.50 MTR Kevlars, 15x8 Soft 8's, Skyjacker Discos, Brown Dog MML, SYE, Smittybilt Rear Bumper/Tire Carrier, Currie Steering, Warn x8000i
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