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I have just ordered a black 65th anniversary V6 JC 4x4. Gas mileage is a small concern for me. I live in Southern California. I currently have a 97 grand Cherokee 4x4. I only use the 4x4 when I am in the Mts. or on the beach. My concern is how does the 4x4 system work in the JC? Can anyone explain it to me? I put the Cherokee into 4 wheel drive. I get 16.1 miles on average in the Cherokee. Will the way the 4x4 sytem in JC is set up use a lot more gas, or does it only start when you need it? Thanks for your help on clearing this up for me.
 

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How the system works depends greatly on which 4x4 system you ordered with the vehicle. The 65th anniversary edition comes standard with QuadraTrack I Full-time 4WD. If you ordered it with Off Group I, then you are going to get QuadraTrac II Full-time, Active 4WD. Which did you order???
 

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Quadra-Trac I is a full time system with a single speed transfer case and Brake Traction Control System (BCTS) which uses the brakes to provide resistance to any wheel that is slipping which allows additional torque to transfer to wheels with grip.

Quadra-Trac II provides similar benefits but also provides a transfer case with a low range.

Quadra-Drive II uses the same two speed transfer case but adds dual Electronic Limited Slip Differentials. These high-tech diffs combined with BTCS allow the system to instantly transfer 100 percent of available torque to any wheel with grip.

Maybe somebody can add to this or correct me if I am wrong- 4X4 is 4 wheel drive all the time. 2X4 you physically have to shift it into 4 wheel drive- typically High or Low. With Quadra you are in 4 wheel drive all the time. Amazingly each wheel is checked for traction 16 times per second and the computer determines where to push power. :eek:
 

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My understanding has always been that 2X4 = two-wheel drive. 4X4 = four-wheel drive, which can be full time (like the commander) or on demand. Not sure about the QTI and II, but the QDII under normal driving conditions distributes 52% of power to the rear and 48% to the front, then adjusts as needed.

I believe AWD that some cars have is something different - 2WD with occasional power to the other 2 when slippage is detected.
 
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