Quadra-DriveII uses the new NV245 transfer case, the new 790AAM front axle, and the new 830AAM rear axle, w/ the new Eaton E-Locker both front and rear. This new E-Locker goes from open diff to limited slip to full lock via input from driveshaft torque and also to full lock via driver's input. It is a very robust system.
Your Quadra-Drive is on-demand; utilizes a gerotor coupling in the Quadra-Trac II transfer case and in the Vari-Lok front and rear progressive axles to send torque to the front driveshaft and/or from side-to-side within each axle when wheel slippage occurs; includes low-range (2:72:1) single-lever transfer case mode operation. It is not a bad system, but it is not in the same league as the Quadra-DriveII.
In an open diff system the power will be sent to the wheel that is slipping, this would be bad when stuck in the sand or in a hole as all the power will be sent to the spinning wheel.
Limited slip helps overcome this to a point but even this will be overcome by torque and will send the power to the spinning wheel as well.
The locker system will ensure that power gets to both wheels. This new Eaton system not only is a locker but also works as an open diff and a limited slip diff. Therefore, you turn corners on the highway like an open, go to limited slip in intermediate conditions and can go full lock in extreme conditions.
Looks like Im buying a locker! I hate Lim Slip,,,,, I have a 72 K5 383 stroke with detroits in dana 60 & 44.... I just dont know these new car systems, Any lockers for Commanders out yet? Or how much cash am I looking at to upgrade to the quad 2 system ? Thanks for the info.
Are you comparing QuadraTrac II and QuadraDrive II? The difference between those is only the ELSD's in the axles which work great as XKPearl said. QuadraDrive was an option in the 1999-2004 Grand Cherokee.
As far as converting I don't think it's that easy - the ELSD differentials are wider so they won't fit in the open axles. Plus you have to have wiring and a module to control them. The Chrysler Corporate 8 1/4" rear axle may have some aftermarket lockers, but the Chrysler Corporate 200mm front axle is new so there aren't even gears available yet, let alone any lockers.
If it makes you feel better, I have the Quadra-TracII on my XK. I considered the Quadra-DriveII but felt uncomfortable w/ a front locker that the driver could not shut-off/disable. You can turn it on at will but by design it will go to full lock by driveshaft torque. These new AAM axles are near bullet proof but I was concerned that it would put too much strain on the half shafts when locked on a hard surface such as rocks (because the XK weighs so much).
The Quadra-TracII uses open front and rear diffs. I will install an ARB rear locker (these are due out shortly) and leave the front diff open. This should serve my needs well. As for yours, the sky is the limit on options if you feel they're truly needed.
I just caught JeepCollectors post, I thought you were talking about the old Quadra-Drive system. If you are talking about the XKs Quadra-Trac system, then that is an entire different ball game. The Quadra-Trac doesn't even have a 4WD transfer case. This system is more akin to a single speed full time AWD system.
I think your system (Quadra-DriveII) is about as bomb proof as it comes from the factory. If you look up American Axle Manufacturing (AAM) and Eaton (E-Locker) you can find more detail on your axles/diff than what comes from Jeep. These axles are reported to be stronger than DANA and easier to work on. You may even see these axles replace the DANA in the JKs at some point.
The Quadra-DriveII uses the new American Axle Manufacturing (AAM) axles front and rear. You'll notice that the rear has a 12bolt cover. They are designated AAM730 and AAM830 IIRC. My Quadra-TracII uses a Chrysler 8.25" rear axle w/ an open diff. To the best of my knowledge Eaton does not make an E-Locker to fit the Chrysler axle. The big three have switched to the new AAM axle for their HD applications. I think Dodge started using them on their Hemi pickups a short while ago.
Thanks for the links They help & hurt at the same time. Did not like reading about the ground clearence.... Looks Like bigger tires Is the only way to go. (I do plan on Going off road alot) Also looks like cutting the fender wells is the only way to go.