Quadra-Drive VS. Quadra-Trac - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 42 (permalink) Old 03-05-2007, 09:59 AM Thread Starter
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Quadra-Drive VS. Quadra-Trac

Could anyone explain the difference between the two, besides that fact that QD has locking diffs?

I got my Commander for $22K new with the 4.7l, tow package, etc as an '06 leftover. To get the Quadra-drive, I would have had to pay for an '07 (15K more), and I felt this was too good of a deal to pass up.

Basically, my question is what specific disadvantage does the QT have to QD?

Thanks!
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post #2 of 42 (permalink) Old 03-05-2007, 10:13 AM
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Re: Quadra-Drive VS. Quadra-Trac

Quadra-Trac I: Has No Low Range
Quadra-Trac II: Has Low Range
Quadra-Drive II: Has Low Range, Electronic Limited Slip Differentials

Quadra-Drive II can shift all available torque to the wheel(s) that have traction within milliseconds. Whether you need it or not depends on what you plan to do with your Commander and how much snow and ice you deal with. What's important is that you got a 4WD Jeep. Those that say they don't need it because they don't go off-roading, don't have snow, etc., don't realize that the 4WD Commander will handle much better on rain slicked roads than the 2WD Commander.

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post #3 of 42 (permalink) Old 03-05-2007, 10:37 AM Thread Starter
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Re: Quadra-Drive VS. Quadra-Trac

Awesome!
I think I would rather have the QD, but it was not worth that many thousands of dollars. We routinely spend a lot of time in the snow (Colorado), but I will not be doing any seriour off-roading in this rig until it is 4-5 years old. Thinking I could add locking diffs then if I need them...

I think the on-board traction control system will suffice for the time in the snow/rain for now...

Thanks for the info!
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post #4 of 42 (permalink) Old 03-06-2007, 09:53 PM
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Re: Quadra-Drive VS. Quadra-Trac

do any of the 06 commanders have the qd. My window sticker says that I have front and rear limited slip locking diff's.
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post #5 of 42 (permalink) Old 03-06-2007, 10:25 PM
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Re: Quadra-Drive VS. Quadra-Trac

All Limiteds are equipped with QDII.

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post #6 of 42 (permalink) Old 03-06-2007, 11:15 PM
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Re: Quadra-Drive VS. Quadra-Trac

Quote:
Originally Posted by rwmorrisonjr
All Limiteds are equipped with QDII.
Sorry, but that is not correct. Quadra-Drive II only comes standard with the 5.7L HEMI. It is an option with the 4.7L.

Last edited by jeep5253; 03-07-2007 at 12:25 AM.
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post #7 of 42 (permalink) Old 03-06-2007, 11:40 PM
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Re: Quadra-Drive VS. Quadra-Trac

Quote:
Originally Posted by shmily524
Basically, my question is what specific disadvantage does the QT have to QD?
Quadra-Drive II can send 100% of the engine torque to any tire (or tires) that has traction. For example, if both left side tires are slipping then all of the power would be sent to both of the right side tires; if three tires are slipping all of the power would be sent to the one tire that has traction. With the Quadra-Trac the power is sent either to the front axel or the rear axel but cannot be sent to specific tires.

Quote:
Originally Posted by shmily524
Could anyone explain the difference between the two, besides that fact that QD has locking diffs?
Quadra-Drive II does not have locking differentials--it has front and rear electronic limited slip differentials.

Last edited by jeep5253; 03-06-2007 at 11:47 PM.
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post #8 of 42 (permalink) Old 03-07-2007, 08:27 AM
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Re: Quadra-Drive VS. Quadra-Trac

Quote:
Originally Posted by commanderlimited
do any of the 06 commanders have the qd. My window sticker says that I have front and rear limited slip locking diff's.
Yes, QDII is available on 06 commanders. You can tell if you have it by looking between your shifter and your cup holders. If it says "Quadra-Drive II", then you've got it =)

!c
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post #9 of 42 (permalink) Old 03-07-2007, 12:29 PM
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Re: Quadra-Drive VS. Quadra-Trac

Quote:
Originally Posted by jeep5253
Quadra-Drive II can send 100% of the engine torque to any tire (or tires) that has traction. For example, if both left side tires are slipping then all of the power would be sent to both of the right side tires; if three tires are slipping all of the power would be sent to the one tire that has traction. With the Quadra-Trac the power is sent either to the front axel or the rear axel but cannot be sent to specific tires.


Quadra-Drive II does not have locking differentials--it has front and rear electronic limited slip differentials.

You're 95% right; I'm sure you just miss worded a statement so I'll clarify that if the three tires, you mentioned above, where to have slippage, electronically it's sensed and the clutch basket/plates will engage a thrust/side pin of some sort distributing power from the ONE tire that HAS traction to the 3 that DON'T.

Overall, the limited slip is a plus for tires that do not leave the ground. If you were to have a tire or two...or three to leave the ground, limited slip is pretty much useless. This is where a locker would be effective unless you know how to work the e-brake w/ the e-slip to create a some what "posi-traction" OR rock the vehicle so the spinning wheels can grab because whichever tire is on the ground...most likely it will nothing more but a kickstand.

Also, it depends on how much you off-road and what you do w/ your vehicle. If you want those tires that are up off the terrain from an off-camber/hung up wheeling scenario to get traction, lockers dominate. That's a whole different chapter though.

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post #10 of 42 (permalink) Old 03-07-2007, 02:27 PM
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Re: Quadra-Drive VS. Quadra-Trac

Quote:
Originally Posted by another chris
You're 95% right; I'm sure you just miss worded a statement so I'll clarify that if the three tires, you mentioned above, where to have slippage, electronically it's sensed and the clutch basket/plates will engage a thrust/side pin of some sort distributing power from the ONE tire that HAS traction to the 3 that DON'T.
another chris, No I am not wrong on this. I have owned a 2000 GC with Quadra-Drive for seven years and thoroughly understand how it works. Anyway, why would you want to send power to the tires that do not have traction? You want it to go to the one with traction to pull you out. If you don't believe me go to the Jeep website and check it out: http://www.jeep.com/4x4/index.html?dvar=5 put you cursor on "GET READY" and then click on "See How Jeep 4x4 Systems Work". Apology accepted.

Last edited by jeep5253; 03-07-2007 at 09:20 PM.
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