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Old 09-02-2012, 09:30 PM   #61
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I drove a 2012 JKU Sahara 3.6 automatic and 3.21 gearing, and I thought it was a lethargic dog compared to my 3.8L 2007 manual 4:10 geared JKU.
That said, I'm sure a 3.6 with 3.73 or 4:10 would make me eat dust, but I can't complain about my 3.8 not being peppy enough with the right gearing.

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Old 09-02-2012, 09:37 PM   #62
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Quote:
Originally Posted by WXman View Post
I can't believe there are still some who regard the ancient 4.0L I-6 as the standard. Have you seen dyno sheets on them? The 3.8L actually made the same torque, and more horsepower. The 3.8L didn't give up ANYTHING to the 4.0L.

The 4.slow was heavy as a boat anchor, leaked oil like a sieve, got miserable fuel economy, and made no horsepower at all. The only reason it was remotely acceptable was becuase it was in 4x4s that weighed less than many family cars. Also, they either would go 500,000 miles or they would blow up at 50,000. It was a crap shoot...never knew what you were going to get. I for one don't miss the 4.0 at all.


It's still a better motor than the two followed it.

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Old 09-02-2012, 10:11 PM   #63
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Does anybody know if the new 3.6 will do a burnout??
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Old 09-02-2012, 10:18 PM   #64
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Just took my 2012 Altitude to the salt flats and broke the sound barrier! You should have heard those seat belts flapping. Thank god for the included Mopar "oh shit" handles. Lmmfao
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Old 09-02-2012, 10:19 PM   #65
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It's still a better motor than the two followed it.


Thanks for the laugh, Barrie, I needed that!
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Old 09-02-2012, 10:48 PM   #66
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Originally Posted by Barrie

It's still a better motor than the two followed it.
You can say that again!
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Old 09-03-2012, 01:58 AM   #67
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It's still a better motor than the two followed it.
A few freinds still have those monster CRT TVs, they still don't want to die after 20 years.
Are they reliable? probably yes, very proven technology and get the work done.
Are they better than LCD? no, in almost every aspect the new HD LCD is better, but they're not proven to be reliable yet.

As a geek, have seen many times that there are some people who just don't want to accept the new things.
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Old 07-10-2013, 09:15 AM   #68
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09 jeep

Hi guys I have a 2009 jeep wrangler 4 door with a 3.8 motor in it I have been looking to start to build it up but before I do I need to know if the motor in my jeep is any good I have hear from some people that the motor starts to fall apart after about 90k I have about 65k on it now and I do get all the schedule maintainence and love my jeep please let me know if any one out there have had any problems with there's or hear facts thanks again
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Old 07-10-2013, 09:56 AM   #69
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Originally Posted by zelenay85 View Post
Hi guys I have a 2009 jeep wrangler 4 door with a 3.8 motor in it I have been looking to start to build it up but before I do I need to know if the motor in my jeep is any good I have hear from some people that the motor starts to fall apart after about 90k I have about 65k on it now and I do get all the schedule maintainence and love my jeep please let me know if any one out there have had any problems with there's or hear facts thanks again
Of course people have had problems. There are millions of 3.8 engines out there. Some are lemons that were disasters right out of the factory.

But that's not the point. You're not really asking whether ANYBODY has had problems. Rather, you're asking about the 3.8 GENERALLY. Whether your specific 3.8 has some hidden defect that's going to cause it to crap out after 10k more miles, I have no idea. But then again, nobody knows that about any engine in their vehicle.

Regarding the 3.8 generally, the people you've heard from are confusing "powerful" with "reliable."

The 3.8s is an old design. It's been around for many years, and is time-tested, easy to repair, and ultimately very reliable. Chrysler put the 3.8 in many vehicles over the years long before it was in the JK, and it's not unusual to see them with 200k or more miles.

So if there's a problem generally with the 3.8, it's not reliability. Your friends are misinformed.

If there's a problem generally with the 3.8, it's power. The 3.8 only puts out about 200 horsepower. And I forget the torque numbers, but they're not spectacular either. Ideally, you'd want both more horsepower and more torque than the 3.8 puts out to move a 4000 lb 4 door Wrangler with aftermarket steel bumpers, upsize mud tires, a lift, etc.

Still, it's enough. Just make sure you regear the differentials to account for upsized tires, especially if you have an auto transmission.

Other than not being a speed demon, there's no reason to fear a well-maintained 3.8 that you personally know has been performing well. If you've had 65k trouble-free miles and have been keeping all of your maintenance current, I'd have no qualms about setting a realistic budget and modding away.

The only caveat on that is that the 3.8 does tend to burn oil. This only seems to affect the longevity of the engine in extreme cases, provided that you are aware of it. Check your oil level every week or so at the gas station, and make sure you add a quart if necessary between oil changes. If you've got to add more than a quart every 3k miles, then I'd say you're an "extreme case." But other than that, you should be good-to-go.

For what it's worth, my 2010 has 50k miles on it. I stick to the maintenance schedule, have had no problems, and don't expect any.
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Old 07-10-2013, 10:54 AM   #70
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I haven't read all replies. I will say when I was deciding between the two, I test drove jeeps with the different motors and same gearing and made my decision that way. It might depend on what you want it for...If it was gonna be a weekend driver or beach jeep maybe it wouldn't have mattered to me. Mine however is a daily driver that I'm gonna pull a boat with quite a bit and for me the 3.6 was head and shoulders above the 3.8 for what I wanted.
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Old 07-10-2013, 12:22 PM   #71
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3.6 / 3.8

hi, i have had both 3.8 auto 2007 2 door. and 2012 3.6 2 door both very good, however the 3.8 got about 13 mpg's the 3.6 gets 23mpg's
i think u can figure it out.. LIFE IS GOOD! THE DIESEL SHOULD BE NEXT
YEAR, 33 MPG'S.......
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Old 07-10-2013, 12:37 PM   #72
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Quote:
Originally Posted by zelenay85 View Post
Hi guys I have a 2009 jeep wrangler 4 door with a 3.8 motor in it I have been looking to start to build it up but before I do I need to know if the motor in my jeep is any good I have hear from some people that the motor starts to fall apart after about 90k I have about 65k on it now and I do get all the schedule maintainence and love my jeep please let me know if any one out there have had any problems with there's or hear facts thanks again
No one knows about your specific motor...but one would guess it would be fine if you have taken care of it. Your biggest issue will be gearing if you are going to build it up. 4.88's or 5.13's are in your future.
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Old 11-24-2013, 09:34 PM   #73
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oil burner

slight problems, i have a 3.8 that uses not a little oil, its to the tune of more than a qt a thousand, and chrysler says that is witnin specs, after 65ooo miles a qt every 750 is within specs, i say bullsh.. am getting ready to go to the massachusetts envoirmental board and see what they say about all this extra oil polluting both the air and wherever else it goes
Quote:
Originally Posted by MTH View Post
Of course people have had problems. There are millions of 3.8 engines out there. Some are lemons that were disasters right out of the factory.

But that's not the point. You're not really asking whether ANYBODY has had problems. Rather, you're asking about the 3.8 GENERALLY. Whether your specific 3.8 has some hidden defect that's going to cause it to crap out after 10k more miles, I have no idea. But then again, nobody knows that about any engine in their vehicle.

Regarding the 3.8 generally, the people you've heard from are confusing "powerful" with "reliable."

The 3.8s is an old design. It's been around for many years, and is time-tested, easy to repair, and ultimately very reliable. Chrysler put the 3.8 in many vehicles over the years long before it was in the JK, and it's not unusual to see them with 200k or more miles.

So if there's a problem generally with the 3.8, it's not reliability. Your friends are misinformed.

If there's a problem generally with the 3.8, it's power. The 3.8 only puts out about 200 horsepower. And I forget the torque numbers, but they're not spectacular either. Ideally, you'd want both more horsepower and more torque than the 3.8 puts out to move a 4000 lb 4 door Wrangler with aftermarket steel bumpers, upsize mud tires, a lift, etc.

Still, it's enough. Just make sure you regear the differentials to account for upsized tires, especially if you have an auto transmission.

Other than not being a speed demon, there's no reason to fear a well-maintained 3.8 that you personally know has been performing well. If you've had 65k trouble-free miles and have been keeping all of your maintenance current, I'd have no qualms about setting a realistic budget and modding away.

The only caveat on that is that the 3.8 does tend to burn oil. This only seems to affect the longevity of the engine in extreme cases, provided that you are aware of it. Check your oil level every week or so at the gas station, and make sure you add a quart if necessary between oil changes. If you've got to add more than a quart every 3k miles, then I'd say you're an "extreme case." But other than that, you should be good-to-go.

For what it's worth, my 2010 has 50k miles on it. I stick to the maintenance schedule, have had no problems, and don't expect any.

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