Jeep TJ Wrangler 1997 -2004 ,V-6 Conversion Package , Retaining the Stock Jeep 5?? -

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post #1 of 13 Old 11-12-2010, 11:43 AM Thread Starter
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Jeep TJ Wrangler 1997 -2004 ,V-6 Conversion Package , Retaining the Stock Jeep 5??

Hey everyone,

Had my jeep since 98' and been LOVIN it. Only problem is... I got a 4-cyl. Now I know i need to upgrade as my miles are starting to climb. I wanted to Switch my current IL 4cyl to a 6 cyl preferrably a new engine. Anyone know of great sites to by engine replacement kits? i Just want to buy everything i need (including block, mounting brackets, etc...).

If anyone has any feedback i would appreaciate it!


Travis Ray

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post #2 of 13 Old 11-12-2010, 11:48 AM
This post/info=my opinion
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2004 LJ Wrangler 
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you can buy a complete V8 conversion kit from AEV or Burnsville Off-Road I would think. Pretty sure you need to source the engine, tranny and t-case though. If you're going to do it, don't go with a V6, just get it over with and go V8.
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post #3 of 13 Old 11-12-2010, 11:48 AM
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im sure you already know this, but the 4.0L is an inline 6
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post #4 of 13 Old 11-12-2010, 12:09 PM
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I agree with Unlimited04, do a V8 swap.

You would probably get tired of the I6 pretty quick.
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post #5 of 13 Old 11-12-2010, 12:39 PM
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not to be disagreeable. but i went from a 2.5 to 4.0, and i find the 4.0 to be more than adequate. i am sure the v8's are awesome power wise...but not everyone needs that.
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post #6 of 13 Old 11-12-2010, 12:42 PM
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I think if I were going to all that trouble I would do a 318 from a durango or ram.

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post #7 of 13 Old 11-12-2010, 12:51 PM
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If you are going to go through the trouble to source the parts, weld in new mounts, replace the transmission, transfer case (or just the input), and computer plus wiring.

Why wouldn't you just put in a V8? There are plenty of them out there. Are you worried about smog and all that CA inspection stuff? Because I'm pretty sure you are going to need to do the same VIN flashing on the computer as you would with the 4.0L.

Or just do what you want. I don't see the point though.
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post #8 of 13 Old 08-13-2011, 06:41 PM
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What about using the Jeep Liberty 3.7L V-6? My wife's Liberty has plenty of power. In the lighter TJ platform the 3.7L and a NV3550 5-speed would been a great combination. Add in a Warn lock-in, lock-out hub conversion and it may even get decent fuel economy. The Liberty came with the NV3550 and the engines are cheap to source at local swap yards. Cheap enough that I could have on rebuild and sitting ready to go in the event of an engine failure.

Using a less powerful engine means that I could get away with out doing expensive axle swaps and upgrades just to keep my axles from failing. In the end, I'd probably still buy a Dana 44 for the rear but a high pinion XJ front axle would work in the front. I can get the high pinion D30 for $50.

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post #9 of 13 Old 08-13-2011, 07:21 PM
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I would go with a 99+ 5.9 out of a ram pickup, or van! Take all the emissions stuff, engine harness, pcm and accessories! You need an engine the same model year or newer to pass smog in ca.
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post #10 of 13 Old 08-13-2011, 07:27 PM
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Some of the V8's will increase your gas mileage as well as power. The 4.7L Power Tech gets better gas mileage than the 4.0. One of the things I wanted to do to my Cherokee before I got rid of it was to swap in a diesel. Great low end torque and much better gas mileage than a gas motor. Either way is good. As much as the 4.0 is a good motor, I wouldn't bother with it.

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post #11 of 13 Old 10-04-2011, 04:44 PM
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I agree with the others, if you are going to go through all the hassle of swapping out the engine, just go for a GM GenIII small block.
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post #12 of 13 Old 10-04-2011, 08:21 PM
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Check out Advance Adapters and Novak Adapters. They not only sell adapters and such, but are a wealth of conversion information.
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post #13 of 13 Old 10-05-2011, 12:50 PM
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Try Golen engines at You can get a stock 4.0 or a stroked 4.6. They have a lot of experience with jeeps. They also sell turnkey V8 engines.

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