4x4 vs. AWD vs. 4WD - Page 3 - Jeep Garage - Jeep Forum

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  #25  
Old 05-28-2016, 10:30 AM
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Re: 4x4 vs. AWD vs. 4WD

In my opinion, the best system ever used on the GC was the QDII offered on the 99-04 WJ's.

This system employed front and rear Vari-Lok differentials that were capable of sending 100% of the engine power to any one wheel that had traction. So it not only shifted power front/rear it also sent it side to side.

Today's QDII is only available with a rear ELSD. The front diff is open and the system relies on the traction control and software to compensate for the lack of it. It no longer has the ability to shift power to any one wheel.

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  #26  
Old 05-28-2016, 10:36 AM
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Re: 4x4 vs. AWD vs. 4WD

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Jeep will mail you a hard copy of the full version owners manual for free if you fill out your info at the link below.

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Actually, I just downloaded the User Guide, too. It actually has some great and easy to find info. This was not included with the car when I took delivery.
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Old 05-28-2016, 12:21 PM
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Re: 4x4 vs. AWD vs. 4WD

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Originally Posted by MDBones View Post
In my opinion, the best system ever used on the GC was the QDII offered on the 99-04 WJ's.

This system employed front and rear Vari-Lok differentials that were capable of sending 100% of the engine power to any one wheel that had traction. So it not only shifted power front/rear it also sent it side to side.

Today's QDII is only available with a rear ELSD. The front diff is open and the system relies on the traction control and software to compensate for the lack of it. It no longer has the ability to shift power to any one wheel.
I had a 99 Laredo QD it was a good system but it doesn't even compare to the QD2 in my 09 Laredo. It's the only QD2 with front and rear electronic lockers it would walk through stuff that would make my 99 spin the tires. Both are good systems though. Why the took the locker out of the 11-16's I don't know.



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  #28  
Old 05-28-2016, 01:15 PM
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Re: 4x4 vs. AWD vs. 4WD

This business of which Jeep system is the best has been debated ad nauseam on this website and other sites. The idea of locked differentials being superior to traction control is absolutely true, but the differences are blown out of proportion by those who have them.

The advantages of that old and trusted technology is only relevant in extreme conditions. If I were to guess, 50% of the time there is no difference in navigating over obstacles; in an additional 40% of the time there would be an non-critical advantage to having locking diffs over TC and finally in the remaining 10% of the case you would not even dream of taking your rig over that terrain despite a full night out on Dispensary Row in Denver.

Think you need Lockers on your Grand Cherokee? Go take a look at Wayalife videos and then decide if you'd join them with your Mall Crawler.

For .

Limited Slip Diffs (i.e. Quadra Drive 2) combined with Traction Control would certainly benefit any car but for all intents and purposes I feel more confident driving in snow with my Jeep with crappy all seasons than with my Subaru with 3 LSDs and no traction control and Conti Extreme Contact DWS. I used to think differently but advances in gearbox and traction control logic and the ability to tailor it for different situations is making LSDs and Locking Diffs redundant for most cases.
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  #29  
Old 05-28-2016, 01:32 PM
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Re: 4x4 vs. AWD vs. 4WD

Touché. I don't plan to ever go extreme off roading. Maybe on a gravelly road in the mountains; maybe the beaches in Daytona; maybe snow up north. But I imagine there are very few taking $50k+ Grand Cherokees into the extremes. That said, and being way past that adventurous stage, I'm happy with all the electronic controls, QTII, Select Terrain, etc. on modern 4x4s. If I go nuts and must trash my car, I'll pick up an old Wrangler or CJ to play with.
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Old 05-28-2016, 07:00 PM
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Re: 4x4 vs. AWD vs. 4WD

Quote:
Originally Posted by f1anatic View Post
This business of which Jeep system is the best has been debated ad nauseam on this website and other sites. The idea of locked differentials being superior to traction control is absolutely true, but the differences are blown out of proportion by those who have them.

The advantages of that old and trusted technology is only relevant in extreme conditions. If I were to guess, 50% of the time there is no difference in navigating over obstacles; in an additional 40% of the time there would be an non-critical advantage to having locking diffs over TC and finally in the remaining 10% of the case you would not even dream of taking your rig over that terrain despite a full night out on Dispensary Row in Denver.

Limited Slip Diffs (i.e. Quadra Drive 2) combined with Traction Control would certainly benefit any car but for all intents and purposes I feel more confident driving in snow with my Jeep with crappy all seasons than with my Subaru with 3 LSDs and no traction control and Conti Extreme Contact DWS. I used to think differently but advances in gearbox and traction control logic and the ability to tailor it for different situations is making LSDs and Locking Diffs redundant for most cases.
If I'm given the choice, I'll pick a mechanical system any day over one that relies on electronics and software to make up for it. The Vari-Loks with the gerotor pumps were bullet proof and completely seamless in operation.
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  #31  
Old 05-30-2016, 09:37 AM
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Re: 4x4 vs. AWD vs. 4WD

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Originally Posted by englanderm View Post
AHA!!! I found this web site that give a more betterer explanation than any I've seen. Take a look.
Jeep's AWD and 4WD Systems Explained
As Benn0 has said, there are mistakes in this article about the Grand Cherokee's 4x4 systems.
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  #32  
Old 05-30-2016, 10:10 AM
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Re: 4x4 vs. AWD vs. 4WD

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Originally Posted by echo7tango View Post
As Benn0 has said, there are mistakes in this article about the Grand Cherokee's 4x4 systems.
I started this thread because I was curious about my HA with 4X4, QTII, Air Suspension, Select Terrain, etc. I can see that just like a**h**s, everyone has an opinion. Some are valid and some seem to be from an alternate universe. Thanks for all the input. I am now among the Jeep cultists and am in love with my Grand Cherokee. From the research, the video posted above, etc., I feel reasonably confident that if I wake up one day and find myself on a sand dune or in the Arizona desert, instead of the flat terrain of South Florida, I will have a good shot at getting through it. I certainly don't plan on putting my High Altitude, with all the Summit type cladding, not to mention my aging bones, through that kind of abuse. And, I don't plan on going 4 wheeling through the Everglades with the monster trucks and air boats.
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  #33  
Old 05-30-2016, 03:47 PM
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Re: 4x4 vs. AWD vs. 4WD

Quote:
Originally Posted by englanderm View Post
I started this thread because I was curious about my HA with 4X4, QTII, Air Suspension, Select Terrain, etc. I can see that just like a**h**s, everyone has an opinion. Some are valid and some seem to be from an alternate universe. Thanks for all the input. I am now among the Jeep cultists and am in love with my Grand Cherokee. From the research, the video posted above, etc., I feel reasonably confident that if I wake up one day and find myself on a sand dune or in the Arizona desert, instead of the flat terrain of South Florida, I will have a good shot at getting through it. I certainly don't plan on putting my High Altitude, with all the Summit type cladding, not to mention my aging bones, through that kind of abuse. And, I don't plan on going 4 wheeling through the Everglades with the monster trucks and air boats.
Yes...people must be crazy to take their Jeeps to places other than paved streets....




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  #34  
Old 05-30-2016, 07:03 PM
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Re: 4x4 vs. AWD vs. 4WD

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And, I don't plan on going 4 wheeling through the Everglades
If you ever change your mind let me know, I'm on the other side of the glades from you. We go out all the time in our 13, gets lonely being one of the only WK2's amongst all the Wranglers.
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Old 05-30-2016, 07:34 PM
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Re: 4x4 vs. AWD vs. 4WD

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Originally Posted by Victor1960 View Post
Yes...people must be crazy to take their Jeeps to places other than paved streets....
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