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Old 05-11-2014, 11:34 PM   #1
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How much would it cost?

Right now I have an 01 Se with the 2.5L 4 Cylinder with the 3 speed auto. Now I'm sure most of you could guess the power absolutely sucks! I'm doing a lift and bigger tires so I'm wanting more power but NOT wanting to do a V-8 swap because I'd like more power but I'd also like to keep as good of gas mileage as I can.

So my question is, how much would it cost to go from my 4 cylinder 3 speed auto to an inline 6 auto? I'd want a shop to do it because I have basically zero engine knowledge. Also what would be the most common auto transmission to pair with a 6 cylinder? (Like number of gears)

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Old 05-12-2014, 08:17 AM   #2
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Your most cost effective move is to sell the 4 cyl TJ and buy a 6 cyl TJ. If you increase the number of cylinders, going to 8 isn't much more effort than 6.

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Old 05-12-2014, 09:45 AM   #3
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I've been told that before. That if I really want the 6 cylinder I should just sell my Jeep now. But I'm sure just like everyone on this site, I'm attached to the Jeep I have now. I already have roughly $3000 invested into it and it's a vehicle I plan on keeping till it's either wrecked or randomly combust into flames.

I'm not looking for cost effective power, just like guys who have Jeeps that the only original thing on it is the tub and frame. They weren't looking for cost effective, they were looking to make it their own.
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Old 05-12-2014, 10:10 AM   #4
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Well it's not a question on how much would it cost. Sky is the limit. First answer, what realistically is your budget? Second, do some research on what is "legally" allowed in NV. If you have to undergo inspections, laws vary greatly on what you are allowed to put in.
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Old 05-12-2014, 10:35 AM   #5
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To do it "right"...your looking at 5-8 grand. For something that will pass all emissions and other inspections, and for which you can be assured that if you take that trail over there, and you have enough gas, you are going to be coming back in that Jeep without breaking down and needing a rescue! Yes, you can do it for "less"...just depends on how good a job you want done. If you are farming out the entire job, I would guarantee it will cost you between 5-8K.
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Old 05-12-2014, 11:03 AM   #6
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Do you know what gearing you have in your axles? A short term fix would be to re-gear the axles for what tire size you are going to.
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Old 05-12-2014, 11:50 AM   #7
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I plan on going up to 33s this summer and am either gonna have 4.56 or 4.88. I'm not sure which would work best with those tires and a 4 cylinder.

I don't have any idea of a budget yet, I'm obviously gonna have to save up the money once I go full time after I graduate. I'm definitely gonna wanna get it done right so I don't have to worry about breaking down.

How could putting a 6 cylinder be considered illegal? Are you saying if it's done wrong or something so it would pass like smog or something?
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Old 05-12-2014, 12:06 PM   #8
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Quote:
Originally Posted by Nvhunter View Post
I plan on going up to 33s this summer and am either gonna have 4.56 or 4.88. I'm not sure which would work best with those tires and a 4 cylinder.

I don't have any idea of a budget yet, I'm obviously gonna have to save up the money once I go full time after I graduate. I'm definitely gonna wanna get it done right so I don't have to worry about breaking down.

How could putting a 6 cylinder be considered illegal? Are you saying if it's done wrong or something so it would pass like smog or something?
I get what you are saying...unfortunately, depending on the state you live in laws, (and also chance of selling later) you very well may be better off regearing/ and switching to a different tranny.

Here are some of the reasons:
1) The right V-8 with the right tranny will get better mileage than any 4 or 6 cyl you can put in it and run off road.
2) Generally the motor you put into your Jeep when doing a motor swap, has to be the same year or newer to meet emissions. And it has to have whatever emission controls that motor would have had from the factory, even if it isn't something your Jeep currently has. It is POSSIBLE to change it/ do the motor swap and, (depending on the state) make it possible to never meet emissions or be able to sell it. Possible not definite.

3) IMO knowing that you plan to use your Jeep as a DD and also off road, and want more power but really want to keep YOUR JEEP, regear regear, regear. There is a guy here local beating "4 angry squirrels" with and 8.8 and 5.11"s and locked in the rear in a YJ, running 37s. and yes it is also his DD to work but it is "in town 15-20 minute drive".

4) If that motor isn't almost dead you are wasting a good motor. There are other ways to get where you want to be, but swapping for a 4.0 6cyl may not be the best use of your money for this Jeep.

Good Luck!!! the numbers I am seeing price wise are "very close" to being dead on....might want to check and see what it would do to your insurance rates also to swap motors......JUST MY .02
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Old 05-12-2014, 01:38 PM   #9
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Your in NV: Do you have to follow all the Leftyfornia smog and CARB standards there? Generally, you get an engine from same year or younger. You will need the harness, ECU, anything you can get your hands on to go with it. That can be a challenge unless you buy a whole car/truck to source the parts from. If you are not doing any of it yourself, then your new friends at the shop will have their own process. It won't be cheap...Stay away from any Jasper stuff....dont ask me how I know. You won't like me when I'm angry!

You might be better off keeping this Jeep for a DD. Buy *another* to build up, but already has the engine and axles you want...probably the way I would go. Keep one bone stock just for daily driving.
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Old 05-12-2014, 06:41 PM   #10
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NOT wanting to do a V-8 swap because I'd like more power but I'd also like to keep as good of gas mileage as I can.
More power doesn't necessarily mean less gas mileage. the straight 6 gets the same mileage of the 4 cylinder and I have a buddy that did a full grand cherokee v8 swap on his tj. Gets 18 around town on 36" swampers. No way I could get that mileage on my lift and 33s
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Old 05-12-2014, 08:38 PM   #11
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More power doesn't necessarily mean less gas mileage. the straight 6 gets the same mileage of the 4 cylinder and I have a buddy that did a full grand cherokee v8 swap on his tj. Gets 18 around town on 36" swampers. No way I could get that mileage on my lift and 33s
Probably get better fuel mileage with an LS motor than the I6
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Old 05-12-2014, 08:43 PM   #12
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So are there better trannys or axles I can add to my Jeep that will give me more power out of the 4 cylinder?

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