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Old 01-01-2016, 09:13 AM
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Exactly what engine come in 2008 Jeep Wrangler JK

I'm looking for three donor vehicles and came across a few this vintage on CR.
I'm not a big fan of modern motors.
Modern just means I have to spend more time under it.


I'm hoping it's not the 3.6 liter that I'm reading about and also view on Youtube that has issues due to dissimilar metals i.e. aluminum heads along with cylinder walls cracking.
I'm just the messenger on that statement so don't shoot me.

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Old 01-01-2016, 09:15 AM
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No edit button here.
Thanks in advance all.

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Old 01-01-2016, 09:24 AM   #3
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The 2007 through 2011 Wrangler come with the 3.8 engine.

It is somewhat under powered. Some of the earlier ones, burned a excessive amount of oil. This was caused by the oil control rings, being improperly installed from the factory. But most do not have this issue!!!
The 3.8 engine has a track record of longevity...
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Old 01-01-2016, 09:30 AM
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The 2007 through 2011 Wrangler come with the 3.8 engine.

It is somewhat under powered. Some of the earlier ones, burned a excessive amount of oil. This was caused by the oil control rings, being improperly installed from the factory. But most do not have this issue!!!
The 3.8 engine has a track record of longevity...
That is the 4 door model correct sir?
This the actual engine Jeep Wrangler Engine 2007-2011 3.8

No overhead valves or 2 piece cylinder heads either which is good for us guys that rebuild.
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Old 01-01-2016, 09:34 AM   #5
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The 3.8 is used in both the 2 door JK and the 4 door JKU, same engine!
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Old 01-01-2016, 09:34 AM   #6
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Also keep in mind the 10-11 I believe, had different computers I believe and we're not a direct swap
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Old 01-01-2016, 10:13 AM   #7
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Different computers, wiring harnesses, and the problably more.

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Old 01-01-2016, 11:04 AM
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Are the auto trannies OK too?
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Old 01-01-2016, 12:59 PM   #9
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The trannies are solid but the gearing is poorly matched. Most folks will regear ..
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Old 01-01-2016, 01:40 PM
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What does regearing run? I don't do differentials.
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Old 01-01-2016, 01:45 PM   #11
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Also Check out 505performance.com They have a stroker long block and kit if your diy.
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Old 01-01-2016, 06:39 PM   #12
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What does regearing run? I don't do differentials.
Depends on your location. Cost vary. Generally the gear sets can be bought as a set with master instal kits for $600 front and rear. Labor varies as well, $400-600.
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Old 01-01-2016, 07:27 PM
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Old 01-01-2016, 08:06 PM
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3.8 engine. vs 2015 JK

I won't be getting the new 2015 but I am getting three donor 1988 JK's and rebuilding the engines. I did test drive a new one today and I hope it handles as well as the 1988's I have allocated.
Question here is how much difference off the line will I be loosing with the rebuilt and smaller 3.8 compared to the brand new Jeep JK I drove today.
TIA,
RRR
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Old 01-01-2016, 08:16 PM   #15
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wait... JK started in 2007....

1988 is a YJ. 2.5l 4-banger


NM. read the post again - you want to install a 3.8 into 1988????
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Old 01-01-2016, 09:23 PM
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wait... JK started in 2007....

1988 is a YJ. 2.5l 4-banger


NM. read the post again - you want to install a 3.8 into 1988????
Sorry for the typo.

2008
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Old 01-01-2016, 09:47 PM   #17
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Quote:
Originally Posted by Redneck Russell View Post
I won't be getting the new 2015 but I am getting three donor 1988 JK's and rebuilding the engines. I did test drive a new one today and I hope it handles as well as the 1988's I have allocated. Question here is how much difference off the line will I be loosing with the rebuilt and smaller 3.8 compared to the brand new Jeep JK I drove today. TIA, RRR
3.8 is bigger, 2012-16 have a smaller but more powerful 3.6. Handling will be the same ..
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Old 01-02-2016, 01:12 AM   #18
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Quote:
Originally Posted by Redneck Russell View Post
I won't be getting the new 2015 but I am getting three donor 1988 JK's and rebuilding the engines. I did test drive a new one today and I hope it handles as well as the 1988's I have allocated.
Question here is how much difference off the line will I be loosing with the rebuilt and smaller 3.8 compared to the brand new Jeep JK I drove today.
TIA,
RRR
Lot's as in 40%. That is how much more powerful the 3.6 is as opposed to the 3.8 and the 3.6 just smokes the 3.8 off the line and in any other way performance wise while getting better fuel economy doing it.
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Old 01-02-2016, 01:37 AM   #19
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Lol you evidently have never driven a properly geared 3.8. The 76hp gain in 3.6 is over 3600rpm which means absolutely nothing in the bottom end. The gear ratio equivalent for a 3.8 to match a 3.6 would be 4.10 in the 3.8 to 3.21 in the 3.6.
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Old 01-02-2016, 01:23 PM   #21
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Lol you evidently have never driven a properly geared 3.8. The 76hp gain in 3.6 is over 3600rpm which means absolutely nothing in the bottom end. The gear ratio equivalent for a 3.8 to match a 3.6 would be 4.10 in the 3.8 to 3.21 in the 3.6.
Same gears and same size tires the 3.6 smokes the 3.8 in every way and by more than a couple seconds faster 0 to 60 which is by no means a bit.

I'm not comparing modified rigs because if you install 4.56 gears in a 3.8 with 35's and a 3.6 with 35's you'll get the same results the 3.6 will walk all over the 3.8. It's simply fact check out some of the reviews with both rigs in stock form same gearing and tire size which is the way 90% of Wrangler drivers will keep their Jeep.
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Old 01-02-2016, 03:15 PM   #22
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Same gears and same size tires the 3.6 smokes the 3.8 in every way.
Of course it does. That was my point, that the average person doesn't realize. The 3.8 was poorly geared right from production. The 3.6 Is geared 2 gear steps lower (within the transmission) then the 3.8 right off the get go. Look at the gear charts. A 3.21 with the 3.6 is the equivalent of 4.10 with the 3.8 and run about the same rpm.

Where the 3.6 runs 1,958rpm with 3.21 gears and 32" tires @70mph
The 3.8 runs 2,080rpm with 4.10 gears and 32" tires @70mph.
Now consider that the sweet spot for best economy and performance on highway for both these engines is 2100rpm.
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Old 06-04-2016, 02:36 AM
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I'm back from the dead. Had some health issues.

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