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I'm a new guy
June 17, 2010
6:12 am
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Hello everyone one my name is Ian. I'm 22 and new to this Jeep thing.

94 YJ
It is all stock!!!
Puney little 4 cyclinder in it 🙁
I dont know to much else about it.

I'm looking into upgrading the engine to a small block v8 very soon. If anyone has done the swap before I'm all ears 🙂

June 17, 2010
12:17 pm
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JohnDF
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Welcome. Glad to have you here. We have several members with YJs and several others that have had them in the past.

I used to wheel a lot. . .

June 17, 2010
1:57 pm
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Welcome Ian! You're in for a lot of fun in the YJ! Stock is a great place to start, lol. We have several members with YJ experience who can give you some great input on what mods to do.

June 17, 2010
2:01 pm
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Fred
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Hi Ian, welcome.

The only person I know of here who's done an engine swap is Joe, jsmorrow. It's a little different than your project though since he's got a TJ.

Are you local in the Sacramento/El Dorado Hills area?

Fred

June 17, 2010
2:05 pm
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Welcome.

Why start with the engine? My puny 4 cylinder gets me everywhere I want to go and helps Brad's gas mileage. lol You just have to feed the squirrels well. There are a lot of other modifications that will make it a much better 4 wheel drive than a V8.

June 17, 2010
2:16 pm
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JohnDF
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Earl has a YJ with a 4 cyl and does just fine on 37" tires.

I used to wheel a lot. . .

June 17, 2010
3:19 pm
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Respect the 22re!
Not sure about the jeep 4cyl...

Welcome!

June 17, 2010
3:22 pm
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BKGM Jeepers
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Hi Ian. welcome to the board. Though most won't admit it, everyone here was looking their stock vehicle at one point. You gotta start somewhere!

Regarding modifications, I would have to agree that an engine swap is best moved down your list.

For an engine swap (I've done one in a car, and one in a Dodge Raider), you need to consider the transmisison and bell housing, not to mention the electrical and often cooling systems. Even if you do it yourself, it is an expensive project. If you are serious, it may be better to sell the 4-cyl and buy a 6. In YJ's the price difference is small between a 4 and a 6. If you go that route, don't buy a 90 or earlier YJ 6, as they run the 4.2 carberated motor.

June 17, 2010
7:21 pm
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Hi back to everyone. I like all the suggestions you guys gave. I'm in the Air Force and live on Beale AFB by Marysville/Yuba City. And would love to start 4 wheeling around the area!

Is it going to being easy/cheaper going with the 6 cylinder route?I have a budget of about 6k does that sway any of your answers at all?

June 17, 2010
7:23 pm
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You should be able to sell the current Jeep, add the 6K, and buy a fairly well built Jeep that's ready to go already.

I used to wheel a lot. . .

June 17, 2010
7:26 pm
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The only problem is the my current engine has a issue with smashing my lower crank bearings. I rebuilt my engine two years ago and had the same problem. That the flakes from the bearing is clogging my oil pump from working.

Could i still sell it? Or sell it to a junk yard?

June 17, 2010
8:10 pm
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350 = BOOM

the 4.0 six cylinder is a nice motor. Good gas mileage on the trail, good torque, nearly indestructable, and is a stock option on YJ's so smog is easy. Spend your money on the things that make wheeling fun like gears, lockers, and tires.

I swapped in a 4.0 in my jeep and I like it. It has 250,000 plus miles on it, has overheated numerous times, ran without oil while wedged in a crevice until the inside parts started making noise, and it still runs like a champ.

Joe (another newby)

June 17, 2010
8:51 pm
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"ROKMYCJ" wrote: 350 = BOOM

Or as Joe puts it: KERBLAMO!

lol lol lol

June 17, 2010
9:51 pm
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BKGM Jeepers
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"ROKMYCJ" wrote: 350 = BOOM

the 4.0 six cylinder is a nice motor. Good gas mileage on the trail, good torque, nearly indestructable, and is a stock option on YJ's so smog is easy. Spend your money on the things that make wheeling fun like gears, lockers, and tires.

I swapped in a 4.0 in my jeep and I like it. It has 250,000 plus miles on it, has overheated numerous times, ran without oil while wedged in a crevice until the inside parts started making noise, and it still runs like a champ.

Joe (another newby)

My question. On a YJ, the Tranny is 21 splines on a 4-cyl and 23 on a 6 (to the T-case). Are the tranny's compatible with either motor? I think your swap was on a CJ, correct? did you go from a 4.2 to a 4.0?

June 20, 2010
12:51 am
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Ok i've been looking around online for weeks now on engines. Anyone know where i should go and talk to some about ordering a new engine?

June 20, 2010
1:27 am
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"Ians94YJ" wrote: Ok i've been looking around online for weeks now on engines. Anyone know where i should go and talk to some about ordering a new engine?

What kind of engine? a hemi? You might want to sell your jeep and buy another with a six cylinder that has some lift and tires. Its really the cheapest and easiest option.

June 20, 2010
5:09 am
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I wanna keep my jeep but do some upgrades to it. I was thinking putting and 4.0 6 cylinder in, and lifting it. Will i have to replace my transmisson or just get a conversion kit?

June 20, 2010
8:38 pm
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"BKGM Jeepers" wrote: [quote="ROKMYCJ"]350 = BOOM

the 4.0 six cylinder is a nice motor. Good gas mileage on the trail, good torque, nearly indestructable, and is a stock option on YJ's so smog is easy. Spend your money on the things that make wheeling fun like gears, lockers, and tires.

I swapped in a 4.0 in my jeep and I like it. It has 250,000 plus miles on it, has overheated numerous times, ran without oil while wedged in a crevice until the inside parts started making noise, and it still runs like a champ.

Joe (another newby)

My question. On a YJ, the Tranny is 21 splines on a 4-cyl and 23 on a 6 (to the T-case). Are the tranny's compatible with either motor? I think your swap was on a CJ, correct? did you go from a 4.2 to a 4.0?

yeah mine was into a CJ replacing the 4.2. I changed my transmission to a T-18 and adapted it to the dana 300. He would probably want to change out the tranny to an ax-15 for strength and adaptability to the np231. I don't know much about the spline counts on the t-case. I think they are the same model, so I would assume that you could change the input if needed. I'm sure someone online has changed out a 4 cylinder in favor of a six.

June 21, 2010
2:17 am
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"Ians94YJ" wrote: I wanna keep my jeep but do some upgrades to it. I was thinking putting and 4.0 6 cylinder in, and lifting it. Will i have to replace my transmisson or just get a conversion kit?

According to this article, the frames are different on 4 and 6 cyl models.

http://www.4wdandsportutility.com/tech/ ... index.html

Quote "Given the ready availability of recycled '91-up 4.0L MPI six-cylinder Wrangler and XJ Cherokee engines, converting a YJ or TJ to a six might sound practical. However, such a swap presents a major challenge: the frames are different between four- and six-cylinder models!"

Google jeep yj engine swap

June 23, 2010
5:06 am
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BKGM Jeepers
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"RockinCrawler" wrote: [quote="Ians94YJ"]I wanna keep my jeep but do some upgrades to it. I was thinking putting and 4.0 6 cylinder in, and lifting it. Will i have to replace my transmisson or just get a conversion kit?

According to this article, the frames are different on 4 and 6 cyl models.

http://www.4wdandsportutility.com/tech/ ... index.html

Quote "Given the ready availability of recycled '91-up 4.0L MPI six-cylinder Wrangler and XJ Cherokee engines, converting a YJ or TJ to a six might sound practical. However, such a swap presents a major challenge: the frames are different between four- and six-cylinder models!"

Google jeep yj engine swap

I never knew they were different. I'd heard about it with a CJ, but not YJ's or TJ's...

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