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Old 11-12-2011, 11:17 PM   #1
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Engine Swap

So i have a 95 YJ right now i only have a 4banger in it and i hate it, just doesnt have that extra umph ya know. i was wondering what kind of mods i would have to do if i was to purchase a 6cyc i think its a 4.0L and drop it in. Anyone have any experience i appreciate any comments.

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Old 11-13-2011, 05:46 AM   #2
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The biggest problem with the four banger is the AX5 transmission. It is a very weak transmission, even for four bangers. Putting in a 4.0 isn't really hard, depending on how you are going to do it... but it does mean you will have to swap out the transmission also. So to change engines, you will have to change out the engine, the bellhousing, the transmission, the engine mounts, and any wiring harness to make it work, also the onboard computer. You will also have to modify your driveshafts and your transmission crossmember.

Search this site and Jeep Forum because a few people do this swap, some with a lot of problems. You may want to go with a different engine choice because you have to change out everything no matter what. A small V8 will give you the power you are looking for, or even a V6.

Personally, I liked my four banger but I kept my jeep pretty much stock in the suspension area. Those 4.10 gears were great for mild trail use. You may want to try 4.88 gears for more oompf and cheaper on the wallet. What do you plan on using your jeep for?

Take care,

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Old 11-13-2011, 01:46 PM   #3
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I really just plan on useing it for hunting, just doesnt seem like it has enough torque or something although i havent really tested it.
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Old 11-13-2011, 01:50 PM   #4
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And if u dont mind id like to ask you a question sense it seems like u know your stuff.
im new to doing work on my jeep myself im just tired of spending my hard earned money and paying someone else to do it, anyway, its about the brakes are they just brake pads and rotors or do i have drum brakes i fig id ask before i start ripping stuff apart
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Old 11-13-2011, 02:03 PM   #5
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Pads up front and drums in the back. The 2.5 has enough grunt to get you through anything you will see on a hunting trail. If you put massive swampers on it it or start rock climbing that's where you run into issues.
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Old 11-13-2011, 02:07 PM   #6
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First off, if all you are doing is hunting with the jeep and you plan on keeping it in a "stock configuration", stay with your four cylinder and your original 4.10 gears. That four banger has the perfect torque for off road IN A STOCK CONFIGURATION. Now if you plan on huge tires and bigger lifts, then the four banger isn't going to do well, although changing your gears to 4.88 will help over come all of the changes. When I went in the woods with my jeep, the four was great. You just have to learn how to use it properly, and that takes practice and patience.

Your brakes are pretty standard. You have disc brakes on the front and drum brakes in the rear. If you want to start doing your own work, buy a Hayne's manual on jeeps. It doesn't have everything in it, but it covers most repairs. It is very helpful if you are new to working on vehicles.

Today I use my jeep for highway driving so I replaced my four banger with a Chevy V6. My thread is posted here on the forum. It is labeled "YJ V6 Conversion Swap", if you are interested. It will give you some idea of swapping motors and such. It is a lot more involved than you think... and truly, for your application, I think you are much better off with your four. My four banger went 100,000+ and I retired it. It didn't retire on me.

Take care,
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Old 11-13-2011, 05:34 PM   #7
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ok so im going to keep the 4banger in there, im running 31's right now do u thing my engine and tranny will hold up if i was just to get new leaf springs and shackels to lift it a lil bit?
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Old 11-13-2011, 05:41 PM   #8
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You shouldn't even need new shackles. Maybe new springs if they are extremely worn.
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Old 11-13-2011, 05:54 PM   #9
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Your engine will hold up fine...Basically it is a good engine for what it was designed for. The problem with the four banger is usually the ECU (computer) and problems with the sensor input... but that is usually with plenty of miles on it. I honestly never had any problem with my computer at all. I just didn't like the computer... Getting new leaf springs isn't a problem. A little lift isn't a problem. When it is overdone, is when its a problem.

Let me be more specific. Your jeep was designed with certain suspension parameters in mind. If you stick within those parameters, you are good to go. If you go outside those parameters, then you have to modify more of your jeep. For instance, many jeepers out there like to crawl over rocks and fallen trees and such... that is fine. It is what they like to do. However the jeep wasn't designed to do that. Therefore they modify there suspension. They want higher lift to clear trail obstacles that they frequently come across... specifically the center chunk on both axles. To do this, they put on huge tires and lift their suspensions to give even more clearance. Once they do this, they generally have to modify the brakes (because larger tires do affect your brakes. They will not work as well on the street) and their steering (changing the height of the suspension affects how your steering will work.) You will notice that modifications "for the trail" do not necessarily help with street driving. Oh sure, you can adapt to it, but it is different, and usually not better.

Today's jeep was designed mainly for the street with some "off road" capability. People who buy their jeeps for off road use aren't really worried about the tradeoff. They want their vehicle to work off road, through everything they put their jeeps through. What is great about a jeep is how versatile it is and how adaptable it is. But understand there is a trade off between street driving and trail driving. Once you commit yourself, you have to do it safely. Your life and your passenger's lives will depend on it.

I had a two inch lift on my jeep and 31 inch tires. The four banger did well BUT I wasn't expecting it to be a dragster or a rock crawler (those seem to be the extremes.) It pulled good, never got stuck and did great in the snow and ice. It was a good motor. It is unlikely it would do better with larger tires and a bigger lift, without regearing your axles. Some have done this and swear by it. Most do not. They find the four banger does have limits with extreme lifts and huge tires. 31s are not huge tires so you will be OK.

Good luck and remember, have fun BUT HAVE SAFE FUN!! Some people want to cut corners and it usually affects safety. Don't do it. Think about what you really want to do and plan it out. The jeep's frame can handle the modifications, but it is up to you to keep it safe.

Take care,

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