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Old 09-09-2014, 10:19 AM
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4-Wheel Drive System on Summit Question.

I'm getting ready to order a 2015 Summit and in talking to the sales person I found out that the Quadra-Drive II system is only available on the Summit with either the Diesel or V8 and is not available with the V6. I was planning on going with the V6 but since I do some light off-roading (I'm planning to put skid plates on the vehicle), does it make sense to step up to the V8 in order to get the QDII system? I know the QDII system has an electronic limited slip differential but is it that much better than the QTII? Don't know why it's not an option on the V6. Help in understanding this would be appreciated.

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Old 09-09-2014, 10:27 AM
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Re: 4-Wheel Drive System on Summit Question.

Understanding why is way above my pay grade.

I went with the V8 in part because of the QDII. Most of my off roading is ocean beaches. Some trails and dirt roads. Based on other Jeeps I've encountered, and speaking to the owners, it is probably over kill.

Not to say I'm not enjoying my Hemi on the open road.


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Old 09-09-2014, 10:34 AM
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Re: 4-Wheel Drive System on Summit Question.

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Originally Posted by jpcortese View Post
I'm getting ready to order a 2015 Summit and in talking to the sales person I found out that the Quadra-Drive II system is only available on the Summit with either the Diesel or V8 and is not available with the V6. I was planning on going with the V6 but since I do some light off-roading (I'm planning to put skid plates on the vehicle), does it make sense to step up to the V8 in order to get the QDII system? I know the QDII system has an electronic limited slip differential but is it that much better than the QTII? Don't know why it's not an option on the V6. Help in understanding this would be appreciated.
with "light" off roading you would probably be fine with the QTII. Probably depends on how you define light, to some people that may mean just a dirt road to others it is a good bit more. the v6 does not have enough power to support QDII. if you really dont want the larger engine i would not step up just because of that unless you really feel you are going to be pushing the limits in your off roading.
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Old 09-09-2014, 03:43 PM
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Re: 4-Wheel Drive System on Summit Question.

Quote:
Originally Posted by jpcortese View Post
I'm getting ready to order a 2015 Summit and in talking to the sales person I found out that the Quadra-Drive II system is only available on the Summit with either the Diesel or V8 and is not available with the V6. I was planning on going with the V6 but since I do some light off-roading (I'm planning to put skid plates on the vehicle), does it make sense to step up to the V8 in order to get the QDII system? I know the QDII system has an electronic limited slip differential but is it that much better than the QTII? Don't know why it's not an option on the V6. Help in understanding this would be appreciated.
If you are not 100% sure then you cannot live without Harman Kardon stereo and front parking sensors go with an overland V6. Ordering all the packages to get it to summit spec apart from items above will still be cheaper......
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Old 09-09-2014, 07:12 PM
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Re: 4-Wheel Drive System on Summit Question.

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Originally Posted by silvermax04 View Post
with "light" off roading you would probably be fine with the QTII. Probably depends on how you define light, to some people that may mean just a dirt road to others it is a good bit more. the v6 does not have enough power to support QDII. if you really dont want the larger engine i would not step up just because of that unless you really feel you are going to be pushing the limits in your off roading.

The only difference between QDII and QTII is that QDII adds a rear ELSD axle. I'd find it extremely hard to believe that the V6 does not have enough power to support an ELSD axle for all but the most extreme offroading, which the vast majority of owners do not do.

While I've absolutely loved the QDII I've had in previous V8 GC's I had no problems getting through the snow last winter with my 14's V6 and QTII. If it handled that well under those conditions it'll be more than adequate for any kind of offroading I'm ever likely to do. The plus side for me is that it meets my needs with better fuel economy.
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Old 09-10-2014, 05:56 PM
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Re: 4-Wheel Drive System on Summit Question.

Quote:
Originally Posted by jpcortese View Post
I'm getting ready to order a 2015 Summit and in talking to the sales person I found out that the Quadra-Drive II system is only available on the Summit with either the Diesel or V8 and is not available with the V6. I was planning on going with the V6 but since I do some light off-roading (I'm planning to put skid plates on the vehicle), does it make sense to step up to the V8 in order to get the QDII system? I know the QDII system has an electronic limited slip differential but is it that much better than the QTII? Don't know why it's not an option on the V6. Help in understanding this would be appreciated.
Its a judgement call only you can make.

Its not an option on the V6 because the V6 may not have enough power to spin the wheels ... but more likely some bean counter decided this was the most profitable packaging. The ELSD uses a different aluminum axle than the standard V6s.

Anyway its all about wheel spin. A QDII vehicle will have less wheel spin and less brake pad wear. You can get around just fine with QTI and also do light off roading. Many do it. Tires are more important for traction. QTII gives you low range (think you need low range?). QD reduces or eliminates wheel spin in snowy or otherwise slippery conditions. Because the SRT has all that power, all SRTs have QD. Helps it to get off the line (launch) at the track. In the end, tires mak more of a difference.
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Old 09-12-2014, 08:22 PM
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Re: 4-Wheel Drive System on Summit Question.

You need the V8 for ELSD because the differential doesn't fit on the V6 drivetrain, it has nothing to do with horsepower or torque (so I'm told), it's a mechanical issue.

QTII is more than adequate for "light offroading". It's adequate for a lot of things. It'll happily do its job with a wheel in the air, which is what everyone gets all giddy about and jumps out of the truck to get photos. The ELSD will do it a bit smoother, with a bit less wheel spin.

I think you'd be hard pressed to find someplace that a QTII would get stuck that a QDII would not, and those places are on upper edges of the difficulty scale.

All that said, I got the ELSD, and thus the V8. It was more "in for a penny, in for a pound" kind of thing than any need to be wheeling at "10-10ths" of capability that the ELSD would prevail.

This is the tell tale video that shows the comparison really well. QT2 is quite capable, QD2 has a bit less drama.

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