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post #1 of 31 (permalink) Old 12-06-2018, 11:14 PM Thread Starter
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Join Date: Dec 2018
Location: Kokomo, Indiana
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 4.7L V-8
4WD
If 4WD - system: QT-II
Current Mileage: 145000
Posts: 12
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Looking to purchase a Commander

Here to see whats up, and get information on what Commanders to purchase and which ones to avoid.
Look forward to interacting!
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post #2 of 31 (permalink) Old 12-07-2018, 03:46 PM
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Join Date: Jun 2013
Location: California
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 175,000
Posts: 473
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If at all possible, avoid 2006-2008 Hemis. They perform well, but poor head design means they can fail catastrophically with little warning. 2009-2010 Hemis are the best overall XKs. 4.7s got a large power boost in 2008, so if you don't want a Hemi look at 2008+ 4.7s. The 3.7 is largely viewed to be underpowered and gets similar gas mileage to the V8s, so if you can afford a better engine, get a better engine.

2008+ models got a revised interior with the better uConnect system, though this may not matter if you're looking at installing an aftermarket stereo anyway.

The XK comes with three different 4wd systems: QTI, QTII, and QDII. They're all active full time 4wd systems.

QDII is the best, and is typically equipped on Hemis and some 4.7s. It has a 2 speed transfer case and eLSDs front and rear that act similar to locking differentials. You can identify QDII by checking that there is a T-handle in the center console to shift the transfer case, and verifying that the rear differential cover is held on by 12 bolts. The center console is also usually equipped with a Quadra-Drive II badge, but I've seen QDII models with the badge removed, and other models with the badge added, so it's not a guaranteed way of differentiating it from others.

QTII is one step below QDII, and has a 2 speed transfer case but no eLSDs. It will still perform well off road but may suffer traction loss in heavy off roading scenarios. It can be identified by a T-handle in the center console and 10 bolts holding the rear differential cover on. Some prefer QTII because it opens up the possibility of adding lockers, which will outperform QDII.

QTI is the lowest 4wd system equipped on XKs, and acts similarly to an AWD system. It has a single speed transfer case, and is acceptable for very light off road use and normal on road scenarios, dirt roads, and snow.

Some XKs also came with 2wd. I wouldn't recommend buying one of those unless you're planning a street/srt8 build.

2006 XK Limited, Hemi, QDII
245/70R17 General Grabber AT2s
Ported/Polished Throttle Body
Flowmaster Super 44
Stock Height Again (For Now)
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post #3 of 31 (permalink) Old 12-07-2018, 04:58 PM
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Join Date: May 2006
Location: Orlando, FL
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 4.7L V-8
4WD
If 4WD - system: QD-II
Current Mileage: 165,000
Posts: 1,465
Great summary.
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post #4 of 31 (permalink) Old 12-08-2018, 09:50 AM
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Join Date: Aug 2018
Location: NY
Own a Commander?: Yes
Model year: 2007
Trim Package: Sport
Power-Train: 4.7L V-8
4WD
If 4WD - system: QT-II
Current Mileage: 170k
Posts: 84
Quote:
Originally Posted by Creek View Post
Great summary.

I agree, great job! Possibly sticky material.
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post #5 of 31 (permalink) Old 12-20-2018, 01:59 PM
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Join Date: Feb 2017
Location: Long Beach, CA.
Own a Commander?: Yes
Model year: 2009
Trim Package: Sport
Power-Train: 5.7L V-8 Hemi
2WD
Current Mileage: 95,500
Posts: 13
Lots of good info..Thanks!
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post #6 of 31 (permalink) Old 12-21-2018, 04:11 AM
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Join Date: Dec 2015
Location: Michigan
Own a Commander?: Yes
Model year: 2008
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 130000
Posts: 132
Pretty harsh on the earlier Hemi's. Not biased even though I have a 2008. Will have to better educate myself on the failures since I've had several Hemi's in this date range and never had an issue.

I assume you are talking about the valve seat issue? If not please expand your comments. Thx

Last edited by quickster2; 12-21-2018 at 04:13 AM.
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post #7 of 31 (permalink) Old 12-21-2018, 10:12 AM
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drm4633's Avatar
 
Join Date: Oct 2017
Location: Middle TN
Own a Commander?: Yes
Model year: 2007
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 130k
Posts: 290
i think this forum has a high sample rate of problematic issues by design. its a forum where people look for solutions to problems. all vehicle specific forums have this issue.
my 2007 runs strong and hopefully will for a while longer. ill fix it if it breaks though
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post #8 of 31 (permalink) Old 12-21-2018, 01:46 PM
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Wombler's Avatar
 
Join Date: Jun 2014
Location: California
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 113676
Posts: 64
Garage
Quote:
Originally Posted by quickster2 View Post
Pretty harsh on the earlier Hemi's. Not biased even though I have a 2008. Will have to better educate myself on the failures since I've had several Hemi's in this date range and never had an issue.

I assume you are talking about the valve seat issue? If not please expand your comments. Thx

Having just suffered and recovered from the valve seat issue...I've done a TON of research on this. I'd argue the 2006-2008 4.7s and 3.7 are safe. It's JUST the 5.7 you want to avoid. Not only are the 2008+ safe from the valve seat, you also get the newer VVT (variable valve timing) engine that has better fuel economy and more power...plus all the extras that the newer trim line will include.

It's actually not a Jeep or XK year range problem specifically for the 5.7. It's actually a Gen3 Hemi range issue from 2003 to 2008. ALL Hemi vehicles are at risk for the valve seats and actually up to 2015 (or around that year) for failed lifters that take out the cam. The issues start arriving as early as 75,000miles but usually average around lower 100k. Mine was 113k. And of course some haven't happened yet...Most of the failed lifters I hear about are on Durangos and the cars around 2010 or 2011, and the lifter design wasn't changed from 2003 until around 2015. Lifter failure is much less common than the valve seats, but both are worthy of the "catastrophic" tag. With that said, a hot engine is what drops the seats. That's why they always die when you stop for gas on a road trip or something, engine is already well heated up and you pulled right off the freeway and quickly stopped, so it cooled rapidly and the aluminum heads vs the steel (?) seats and the seat just falls out. SOOOO, if you've always been real easy on the motor, always in a cooler climate, let it idle before shutting it off, or even just had a cooler thermostat...might never have an issue! Yes, sometimes the seat drops BECAUSE of a radiator that blew, fan that failed, thermostat fail, etc etc....but ultimately riding the line on the hot engine crammed in a tiny space.

Any quick google search about the hemi seats (not vehicle specific) and you have pages of those LX cars, but not many (if any) XKs, maybe a few WKs. Because there is SO many of those cars out on the roads. So yaaa, our sample rate is a little biased here because this is all we are and have, haha.

I think the major point here is that our XKs aren't getting any younger, so prices/values are dropping, etc. Do you want to take the risk or just buy into a safer year, or the 4.7?
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2006 Dark Khaki Limited, Hemi, QD-II w/ all the options.
Inertia Performance Heads, Full SRT 6.1 Valve Train, Custom ground Crower Cam, Double Roller Timing, Trend Performance forged Pushrods, High PSI Oil Pump, ARH Long Tube Headers and Mids, Borla Catback, aFe Stage 2 Intake, AEM X-Series UEGO, MDS On Light, Kenwood in-dash Nav, HID Projectors and full LED lighting upgrade

Still ironing out the tune, need to get it on a dyno....
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post #9 of 31 (permalink) Old 12-23-2018, 04:12 AM
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Join Date: Dec 2015
Location: Michigan
Own a Commander?: Yes
Model year: 2008
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 130000
Posts: 132
Wombler thx for the reply. How did you recover from the issue. New engine, rebuild existing? thx
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post #10 of 31 (permalink) Old 12-24-2018, 03:13 PM
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Join Date: Jun 2014
Location: California
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 113676
Posts: 64
Garage
Quote:
Originally Posted by quickster2 View Post
Wombler thx for the reply. How did you recover from the issue. New engine, rebuild existing? thx
I chose to rebuild, which lead to lots of upgrades because "well, if I have this part off I might as well put a new one back on...and if I'm going to get a new one, I might as well get an upgraded version..." and I end up with the mess in my signature, lol. I was really paranoid about the failing lifters as well, had some hoses leaking and overall the Jeep is 12 years old...so I just started replacing EVERYTHING.

The thing with the dropped valve seats is finding a machine shop that doesn't just replace the dropped seat, but fixes all of them with higher tolerances so you know it won't happen again. I REALLY lucked out with my situation where the valve seat didn't break and destroy the piston by bouncing around in the cylinder. It only dropped crooked and prevented the valve from closing so it was almost impossible to get started and obviously won't run well when it would start. Most situations aren't so lucky. I've got a thread somewhere here of the process I went through just to discover the valve seat was the issue...I was totally ignorant to it being a common problem.

I saw a how-to video and situation on an LX car where they spent right around or under $1000 and had it fixed in a weekend in their driveway. And he needed a radiator and TWO pistons. Both valve seats dropped in the same head, and i don't remember if he replaced both heads or not. But he found a machine shop via ebay that claimed they were "upgrade fixes", not performance upgrades, but the seats shouldn't be at risk of dropping again.

With alla that said...i think I've seen quotes of shops charging $4-7000 to fix it for you (not guaranteed to be the upgrade fix or not). However, you can get a new crate motor for about $3000, again unknown on upgraded seats since it will still be an 03-08 block....so it all really depends on your mechanical capabilities or how deep your wallet is for what option to chose and how far to let it take you!

Some people are actually just sitting on a "rainy day fund" for when this happens to them. Some chose to rip the heads off and get them redone BEFORE it happens.....and then most aren't doing anything at all.

2006 Dark Khaki Limited, Hemi, QD-II w/ all the options.
Inertia Performance Heads, Full SRT 6.1 Valve Train, Custom ground Crower Cam, Double Roller Timing, Trend Performance forged Pushrods, High PSI Oil Pump, ARH Long Tube Headers and Mids, Borla Catback, aFe Stage 2 Intake, AEM X-Series UEGO, MDS On Light, Kenwood in-dash Nav, HID Projectors and full LED lighting upgrade

Still ironing out the tune, need to get it on a dyno....
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