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post #1 of 5 (permalink) Old 03-05-2019, 07:18 AM Thread Starter
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Join Date: Mar 2019
Location: Calgary, AB, Canada
Own a Commander?: Yes
Model year: 2008
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QT-II
Current Mileage: 350,000km
Posts: 4
Too invested to give up

Hey everybody,
I'm a proud owner of a 2008 Commander Limited Hemi. It just rolled over 350,000km on Christmas (yes I'm Canadian )
In the last year, we've put about $10K in work to this thing (new tires, new suspension, fixed exhaust leak, PCM replaced).

I absolutely love this vehicle but it now has a problem which seems to be baffling local mechanics.
I was leaving work one day last summer when all of a sudden it felt like something just let go because my rpm shot up but it wasn't moving me anymore. Felt like I just got shifted into neutral. Whole this was happening, my front driveshaft was still spinning. However, 4LOW still works just fine. I replaced the transfer case twice now (one from a wrecker and one new rebuilt from Chrysler). I have also tried replacing my FDCM but that did not fix anything. Both times we replaced the transfer case it would work for a little while and then I'd run into this problem again.

A quick Google search came up with that somebody else had this problem and replaced a CV. I had replaced my own CV last year before all of this had started and had noticed the one I was putting in was about .5" longer on the end going into the diff than the one I was pulling out. I was told this wouldn't be a worry as long as it sealed.

Help?
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post #2 of 5 (permalink) Old 03-05-2019, 02:14 PM
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consumedbywater's Avatar
 
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: 478
Garage
When you're in 4 high, your transfer case is essentially open, meaning power will go out the path of least resistance. If your front driveshaft was still spinning, then it was operating as expected. The reason it moves in 4 low is that 4 low locks the transfer case, sending power out to the rear and actually getting power to the ground.

The problem most likely lies somewhere in the front differential. For whatever reason, power is making it to the front differential but not to the wheels. I doubt it's related to the half shaft you replaced earlier, but it is a possibility. Regardless, your diagnosis should start there.

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 5 (permalink) Old 03-05-2019, 09:44 PM Thread Starter
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Level up: 49% Level up: 49% Level up: 49%
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Join Date: Mar 2019
Location: Calgary, AB, Canada
Own a Commander?: Yes
Model year: 2008
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QT-II
Current Mileage: 350,000km
Posts: 4
Quote:
Originally Posted by consumedbywater View Post
When you're in 4 high, your transfer case is essentially open, meaning power will go out the path of least resistance. If your front driveshaft was still spinning, then it was operating as expected. The reason it moves in 4 low is that 4 low locks the transfer case, sending power out to the rear and actually getting power to the ground.

The problem most likely lies somewhere in the front differential. For whatever reason, power is making it to the front differential but not to the wheels. I doubt it's related to the half shaft you replaced earlier, but it is a possibility. Regardless, your diagnosis should start there.

I had no idea that my problem could even take place in my front diff to begin with but then I found this link which perfectly describes my problem and they replaced CV Shaft and it apparently fixed it.

https://ca.cargurus.com/Cars/Discussion-t24821_ds763106
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post #4 of 5 (permalink) Old 03-06-2019, 10:01 PM
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Big Blue's Avatar
 
Join Date: Oct 2015
Location: East Coast of Florida
Own a Commander?: Yes
Model year: 2008
Trim Package: Sport
Power-Train: 4.7L V-8
4WD
If 4WD - system: QT-II
Current Mileage: 101,200
Posts: 5,333
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Quote:
Originally Posted by Mtnbiker View Post
I had no idea that my problem could even take place in my front diff to begin with but then I found this link which perfectly describes my problem and they replaced CV Shaft and it apparently fixed it.

https://ca.cargurus.com/Cars/Discussion-t24821_ds763106
Sounds like a good place to start;

Welcome to the forum; Here are some links to help you out if you want to do upgrades or repairs to your XK;

Chrysler/Jeep Factory Parts: http://www.factorychryslerparts.com/...ukey_make=1064

Cheapest factory Parts: Find OEM BMW, Fiat, Ford, GM, Mopar, Nissan, Subaru & Toyota Parts & Accessories

JeepinByAl: JBAoffroad.com

JustforJeeps.com - http://www.justforjeeps.com/?gclid=C...9i0hoCSS7w_wcB

Rough County lift kits - Suspension Lift Kits, Body Lifts, Leveling Kit, 4x4, Jeep, Chevy, Dodge, Ford, Off-road Truck | Rough Country Suspension SystemsŪ

AFE: Advanced FLOW Engineering | Engineered Adrenaline

CARiD.com - http://www.carid.com/?gclid=CjwKEAjw...NrrxoCEBbw_wcB

Bilstein shocks & struts - Home

WAM Custom Bumpers - https://wambumpers.com/

4WheelParts.com - Truck Parts & Jeep Parts - Lift Kits, Winches, Tonneau Covers, Tires, Wheels, Bumpers, Performance ? 4 Wheel Parts

RockAuto - http://www.rockauto.com/en/catalog/j...catalog%2Fjeep

Also, please read this if you haven't done so already - lots of good information in here;

REQUIRED READING!!! New Member Introduction post & other important new member info.

Thanks and again, welcome aboard.


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Last edited by Big Blue; 03-06-2019 at 10:06 PM.
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post #5 of 5 (permalink) Old 03-10-2019, 04:39 PM Thread Starter
Junior Member
Points: 25, Level: 1 Points: 25, Level: 1 Points: 25, Level: 1
Level up: 49% Level up: 49% Level up: 49%
Activity: 4% Activity: 4% Activity: 4%
 
Join Date: Mar 2019
Location: Calgary, AB, Canada
Own a Commander?: Yes
Model year: 2008
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QT-II
Current Mileage: 350,000km
Posts: 4
Quote:
Originally Posted by consumedbywater View Post
When you're in 4 high, your transfer case is essentially open, meaning power will go out the path of least resistance. If your front driveshaft was still spinning, then it was operating as expected. The reason it moves in 4 low is that 4 low locks the transfer case, sending power out to the rear and actually getting power to the ground.

The problem most likely lies somewhere in the front differential. For whatever reason, power is making it to the front differential but not to the wheels. I doubt it's related to the half shaft you replaced earlier, but it is a possibility. Regardless, your diagnosis should start there.
Thank you so much for confirming my suspicion. Just finished replacing the shaft I had put in before. Turns out the splines on the tip past the "c clip" were worn down a bit, most likely due to it being a used one I purchased. But the brand new one is Now installed and running great. Will update if this issue happens again.
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