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Quadra Drive: =All Wheel Drive?

21K views 28 replies 14 participants last post by  Jim_in_PA 
#1 ·
Ok, I may have just missed something--I really have tried to find this in the manual, but can someone who has better knowledge verify that with the Quadra Drive II system and Select Terrain in Auto mode, the GC is in 2-wheel drive mode unless it detects slip, etc., then goes into 4WD mode as neccessary or you manually select a different full-time 4WD mode like SNOW, etc.? Thanks in advance for the help and answers, I love this forum! HAPPY NEW YEAR guys!:)
 
#3 ·
Technically you only two wheels driving, one front one rear. Rear Axle acts as an open differential until wheel slippage is detected.
 
#7 ·
The way I am looking is that sometimes traction control on the front could be more problem than help. If all 4 wheels do not have good traction the rear will lock and try to push, but front traction will apply brake to the left, then to the right, back to the left, back to the right .... trying to get traction on one of the wheels but overall will be breaking than pushing. So rear is pushing and front is breaking. Overall the vechicle is not moving or.... moving slow. I live on 10deg hill and when is snowing my front wheel drive Chrysler 300 can not make it to the top because traction control is breaking all the time. If I turn it off I could make it better with a lot of whell spin. But my WJ Overland with QD does not have any problems because varylocks are locking all the wheels and just goes and I have never used winter tires in Wisconsin. I am assuming that in the snow mode the traction control is limited and allows more wheel spin to help pushing. You could see it in the other post with select terrain video when in the snow mode rpm's are 2000 and TC was ON only one time.
Please correct me if I am wrong. I am not trying to say bad things about WK2, just want to explain it miself too.
 
#10 ·
Check this out...
This is from the Jeep site but is more for WK because it has LSD in front and rear. WK2 with QD is not explained there yet.

Quadra-Drive II®

Quadra-Drive II's active full-time 4WD system is the ultimate for virtually any driving situation. This system uses the Quadra-Trac II® transfer case and Electronic Limited Slip Differentials in both axles, offering excellent tractive performance. Quadra-Drive II also features a 2.72 LOW-RANGE and NEUTRAL.
 
#11 ·


This is from the Jeep site but is more for WK because it has LSD in front and rear. WK2 with QD is not explained there yet.

Quadra-Drive II®

Quadra-Drive II's active full-time 4WD system is the ultimate for virtually any driving situation. This system uses the Quadra-Trac II® transfer case and Electronic Limited Slip Differentials in both axles, offering excellent tractive performance. Quadra-Drive II also features a 2.72 LOW-RANGE and NEUTRAL.
Check out the description! ;)

 
#13 ·
Quote:
Originally Posted by xoxSTUGOTSxox
Check out the description! ;)



That's true, but from what I've heard the QDII system is not the same on the new WK2. It no longer has ELDS in the front axle like the WK and Commander.
x2. This was my point too. It is different and Jeep is not saying anything about it.
 
#15 ·
Only other info I see...




Selec-Terrain™ System is available on all Jeep® Grand Cherokees with the 2-speed transfer case. Two versions are available: Off-Road Group I includes Selec-Terrain modes, transfer case range selection, and Hill Descent Control, Off-Road Group II includes same features plus Air Suspension and a rear Electronic Limited Slip Differential (ELSD).


The All-New Jeep Grand Cherokee instantly offers optimal on- and off-road traction with the available class-leading Selec-Terrain System. The Selec-Terrain control dial allows the driver to choose from five driving conditions in order to achieve the best driving experience on all terrains:



AUTO

* Standard Electronic Brake Controls
* Torque on Demand
* Air Suspension at Normal Ride Height (if equipped)


SNOW

* Standard Electronic Brake Controls
* 50/50 torque split
* 2nd Gear launch from a standstill
* Air Suspension at Normal Ride Height (if equipped)


SPORT

* Traction Control Limited
* Up to 80% rear drive torque split
* Air Suspension at AERO (if equipped)


MUD/SAND

* Off-Road Electronic Brake Controls
* 50/50 torque split
* Air Suspension at Off-Road 1 (if equipped)


ROCK

* Off-Road Electronic Brake Controls
* 50/50 torque split
* Air Suspension at Off-Road 2 (if equipped)
* Available in 4LO only
 
#16 · (Edited)
The way it was always explained to me was QT I can adjust torque from front to rear or rear to front if needed and there is no low range. QTII can adjust torque front to rear or side to side (any two wheels) if needed and you get a transfer case with low range. QDII does the same as QTII plus it can send ALL torque to one wheel if needed and you get the ELSD (which use to be front and rear but now in the WK2 it’s only the rear). The best is QDII as the computer is sensing all wheels all the time.

When I purchased my '99 Grand Cherokee Limited it came with a VHS video showing a QD Jeep pulling onto a bunch of rollers (under each individual wheel) and the Jeep spun all four wheels and would not move. When they applied the brakes to one (any one wheel, they showed all four wheels, and the Jeep drove off every time) of the sets of rollers that wheel gained traction and the Jeep drove off with traction to only one wheel. The ONLY (they showed Ford, Chevy, Toyota etc..) other 4WD that passed the same test was the HMMWV (Military hummer) as it is still today “true Full time 4WD” meaning power to both rear wheels and the right front all the time (when the transfer case is placed in LOCK it locks the left front wheel in hence locking both front and rear axles).

In 1980 the EPA said no more Full time 4WD because of the gas shortage so 1979 was the last year for true, for sale to the public vehicle non-computer full time 4WD pick-up truck. The only “true” one today is the military HMMWV because the EPA has no control over the Department of Defense. QDII is the next best thing, heck its the only thing I will drive.
 
#28 ·
The way it was always explained to me was QT I can adjust torque from front to rear or rear to front if needed and there is no low range. QTII can adjust torque front to rear or side to side (any two wheels) if needed and you get a transfer case with low range. QDII does the same as QTII plus it can send ALL torque to one wheel if needed and you get the ELSD (which use to be front and rear but now in the WK2 it’s only the rear). The best is QDII as the computer is sensing all wheels all the time.

When I purchased my '99 Grand Cherokee Limited it came with a VHS video showing a QD Jeep pulling onto a bunch of rollers (under each individual wheel) and the Jeep spun all four wheels and would not move. When they applied the brakes to one (any one wheel, they showed all four wheels, and the Jeep drove off every time) of the sets of rollers that wheel gained traction and the Jeep drove off with traction to only one wheel. The ONLY (they showed Ford, Chevy, Toyota etc..) other 4WD that passed the same test was the HMMWV (Military hummer) as it is still today “true Full time 4WD” meaning power to both rear wheels and the right front all the time (when the transfer case is placed in LOCK it locks the left front wheel in hence locking both front and rear axles).

In 1980 the EPA said no more Full time 4WD because of the gas shortage so 1979 was the last year for true, for sale to the public vehicle non-computer full time 4WD pick-up truck. The only “true” one today is the military HMMWV because the EPA has no control over the Department of Defense. QDII is the next best thing, heck its the only thing I will drive.
That is exactly how it was explained to me as well. My only question is, do I have to change all four tires on a 2006 Commander with the quadra-drive II every time I have one tire go bad?
 
#19 ·
It's simpler to just think of these systems as being one wheel drive until that wheel slips, and then a different wheel, or perhaps two, will come into play to transfer the power. 4 wheel drive is a misnomer...you have two driving wheels at most! In QDII, the limited slip rear diff is retained for the WK2, and brake application is used for the front diff to transfer power. The engineers say it's as effective as previous systems, so now that it's snow weather, report your findings!
 
#26 ·
#27 ·
rebuilt transfer case

You also don't necessarily live in the best place for a transfer case like this either. Waaga Way (HWY 303) hill can be hard on the transfer case not to mention the other big hills in the area. I know that area all too well. I was just back there in July for my new grandkid and lived for 12 years up near Rolling Hills Golf Course.

I take it you are using the dealership down in Tacoma. How are they treating you? I've heard mixed reviews of them.

I have had a lot of good luck with these guys, rebuilt transfer case, they have a bunch of salvage yards across the country
 
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