The Jeep 4.0L vs. the 3.8L | TruckU | Season 8 | Episode 18 

Bounce it off the limiter a few times she'll kick a rod eventually

That happened to our 2009 JK 3.8. Still running fine at 150k miles knock on wood. It’s known for consuming oil yet is considered to be a durable engine so I think you’re a little off base. Im sure many people have run the 3.8 low on oil.

Brad Bowman RT

I do like the guys on the show, and used to watch it all the time. But the show does seem to be more sponsor content than actual useful information.

agree. They spent 2 minutes on the 4L and all they did was put the old head back on.

"This episode sucked ass" ...as it was a controlled advert for products / sponsors and not a head-to-head competition to where the 4.0L vs 3.8L duked it out was ever shown. The Jeep 4.0L is the superior engine in all regards and it's wasn't even wheeled in the same terrain, yet even driven where the JoKe was. If the TJ were offroad, it would have gobs of controlled low-end torque to beat the minivan motor that the thin sheetmetal'd Jeep JoKe used. ChryCo. Jeep shot themselves in the privates by getting rid of that AMC inline six motor: it was old and not modern, but worked for what it was designed to do and was tougher than any v6 that Chrysler used after it. Horsepower sells cars; Torque moves them. *Last year for any real Jeep was 2006*

Dirt everyday rocks !

Blake Graves lol thought the same thing

yet there are far cheaper superchargers for the 4.0, even a set up to use junkyard ones off the gm 3.8 lol but hey guess that would be unfair right haha

You did not watch the whole thing, as you said, so let me fill you in on the comparison: there was never any sort of dyno or actual driving comparisons made. None. This is total CLICKBAIT shit posted to sell stuff to kids. It is garbage. You called it. I wish I had read your comment before wasting over twenty minutes of my life waiting for comparisons between the two engines that never happened. Further, ding-dong dripped the rear of the head onto the gasket before it was lined up. In fact, the gasket was not even on the block straight. You can see the other guy have to move it back after the first one dinged up the cylinder 6 area. You can clearly see it. I am fairly certain that the head gasket was pinched hard in several spots, and that's a big no-no. TruckU sucks.Someone needs to tell them to TruckOff!

Gotta make it fair ...for the price of the blower though you could drop a 4.7 in the tj

3.8 has such a huge power advantage. Its based off Mopar wedge engine with high output inmind during design. Even our 3.3s are wound like the eagle hemi with power to weight ratio.

23v0lv32 I almost have 330,000mi. on my 99 Xj and it still runs and looks like new. Definitely one of the best motors ever.Run forever

I got 2. 1 has 305,000 other has 294,000 still running top notch. The best. And found, to me, basically a brand new 06 tj with only 57,000 on it. Cant beat em

23v0lv32 even when she’s cracked she’ll go as long she ain’t leaking too bad 😂

Great man! One of 99 XJ 4.0L/AW4 is coming up on a quarter million. Still fries the rear tires in 2WD. I love it. Don't think the engine has ever been apart. I have 4 total: 2) 2doors, 2) 4doors. Combined they have probably 730,000+ miles. Awesome rigs! 3.8V6 is a joke. 4.0I6 forever!

2000 xj 218,000 daily driver, had a 96 with 238,000 then a damn deer ended that

When I was researching my caravan with 3.8 I remember reading that the 3.3 and 3.8 couldn't handle boost. I wonder how long this engine lasted (or if they did something to make it tougher).

How about valve adjustments?

99 tj 4.0 225000 on odometer just replaced timing components

Elias Salazar: 235,000 3.8 still rolling just fine, and I beat on it. and still pulling vacuum from the oil cap. No blow-by.

Just had a rod bearing spin on my 07 JK with 168k on the motor.

I want to do a stroker 4.0L based engine swap in my 2004 WJ Freedom Edition. But the damn 4.0 runs perfect, it gets 18MPG all day, and it won't die.

@@xmo552 That would be AWESOME! 4.0 is bullet proof.

Hunter Sieling I got a 91' Cherokee with a 4.0 in line 6 that I'd been wanting to fix up

I love my Jeep. Its beaten up,not very good on fuel but it keeps going. I have got quite a few better nicer cars but my XJ 4.0 is actually my favourite.

This is why I put a 4.0 and AW4 from a 1994 XJ in my JKU. So much better than the shitty 2.8 crd at came with.

Amen! My dad worked at the Kenosha Engine Plant where many of them were made. He was a Journeyman Tinsmith.

J J when the 2.5 and 4.0 died, jeep died with them.

Figured it’s worth mentioning the issues are from 1999-2002 pre 99 or most of the mid 02 year motors didn’t suffer from the poor quality 0331 cylinder heads

Yep, my 99 2door still goes down the highway 100 mph.

Lol because there is none.... 4.0 rules

YuckFou502 do it

You won’t do it!

DO IT!!!

YuckFou502 my wife speeds as is let’s not give her any ideas 💡 lmao

Yea, I dare ya to do it.

4.0l is nice to stroke out as well

The solution to the oil consumption issue with the 3.8 is use to use 5w-30 instead of 5w-20. That’s what the engine originally called for. Chrysler changed to the lighter weight to improve fuel mileage to improve EPA standards. The 3.8 is totally fine. I don’t get why so many like to rag on it. I’ve had a 2009 JK with the 3.8 in it for 12 years and it now has 150k miles. I’ve never found it lacking.

Same here got a 1993 with 385k never skips a beat.

What tye of oil and filter do you use ?

Why yank the head to change valve seals? Just roll the piston to TDC release the spring and change the seal. But oh well I saw where this was going and checked out.

When you say "church" you really mean off-roading, right? I know that's where my church is.

Looks a lot easier than my miata Head, and even that is really simple.

Yes, agreed. But I HATE the Hemi swap option because I like it to be closer to original. I want to do the 505 performance kit to beef up my 3.8 then strap a super on it. F Hemi in a jeep. I like to keep the engine bay accessible for tail fixes.

jimmy neutron

I love the 4.0, but to ignore the huge number of high mileage 3.8s out there is just bad math. It doesn't measure up to the 4.0 in the power arena, but they aren't fragile. And the minivan line is old. How many v8 station wagons shared a motor with a muscle car? Many, and I've yet to gear anyone bitch about an impala or camaro having a "station wagon motor. "

nate taubitz the 505 kit doesn't seem like it's the answer everyone hoped it would be. Hemi in a JK? Eh, you could, but the best value looks like an LS swap.

jimmy neutron 330,000 and still going strong.

The Jeep 4.0 DOES NOT have overheating ISSUES ,,,,Due to it's design! LISTEN up,THIS IS AN OLE SCHOOL BLOCK HAS MORE COOLANT TRAVEL PRESSURE ALL ENGINES IN THE 40,,s50,s60,s to about 1977 THE LOWER HOSE ALWAYS HAD WIRE SPRING INSIDE WHEN YOU GOT ONE AT AUTOSHACK,NO ORIELY,AUTOZONE or ADVANCE ,,,THIS WIRE KEPT THE HOSE FROM COLLAPSING,THE 4 .0 IS A SPINOFF FROM HUDSON ONE OF THE FINEST AUTOMOBILES EVER MADE,HUDSON WAS BOUGHT BY AMC, THEN CHRYSLER' BOUGHT AMC THE 4.0 IS 70 YEARS OLD!!

I call bs!

It's bullshit. Of course it is engine defendant. But you might see 10hp at the most. 25hp gain might be true if you compare 1.3 break in rockers to 1.6 or 1.7 aftermarket rockers 🤣

I bet you they were heavily sponsored by Felpro; all they did was jerk themselves off while talking about gaskets.

Well fel pro works. A lot of racing people use them.

John Are you running a 4.5L? What kind of MPG are you getting ?

If they're different ratio rockers you can gain some power, but 25/25 is a bit much

lol i have a set of 1.7 rollers in my 4.0 and well you notice them you kinda dont to be honest, and no it was not 25/25 it was about the same as a good exhaust and air filter change, noticeable but not by much

They said 2.5 if that🤣

jason allen Your comment looks like a toddler wrote it.

i know people with 4.0 cherokees running to 713k miles

NoahBones 12: I hope I don't sound like an asshole, but what's the reasoning for so much hate on the little 3.8. It's been reliable for me 235,000 just the regular stuff done by myself.

Zachariah Woller i never hated on the 3.8, although i wish they brought back then 4.0 i6

NoahBones 12: okay sorry I used your name I was trying to talk to the whole group. But I understand. I loved the 4.0 itech AMC engine. I have a 5 speed version that I turboed, sounds like a Cummins. I just don't understand the reasoning for hate on the EGA serise and the EGJ series engines from Chrysler.

nonono..... 1 word: Cummins

Blake Watson 4.0 is one of the most reliable motors ever made.

Stock 4.0 lifters last forever.

ed christman Yeah we've been screwed over by chrysler.

Yeah I see them too, they are all in the scrap yard it's really weird.

Yeah but full rebuilds don't really count towards that really.

mine is at 160K and still going strong.

I had just under 300k on mine before it was stolen. Still hate the engine though. I miss my TJ with the I6.

Liam S it doesn't

These might give you 5,but you BEST BET STAY WITH SOLID LIFTERS THE 0 tolerance Suits the 4.0 BEAST THE BEST,THE ROCKERS WILLFAIL PENBEARINGS WILL DAMAGE ENGINE! THESE TWO KIDS DONT UNDERSTAND OLE SCHOOL ENGINES!