Quadra drive 2 is like having air lockers every time you wish you had them, and never wishing you had turned it off to steer or handle some off camber.
Despite what I've heard claimed by QTII fans, even when they point me to a youtube video that "proves" it works just as good, I can see the QT doing a lot of spinning before it caught, and the QD2 doesn't. I have it on my WK, and it's amazing. I wish I had it on my F150.
It uses a number of clues to decide when to be at 100% lock, and when to be somewhere between that and zero lock. In high range, it's watching throttle position, wheel speed sensors, steering angle, and it's remembering what you just did. In low range, it locks up all the time, but it still seems to make some relief when you turn the wheels. In 4 high, when I inch one tire up a gravel pile (on my buddy's gravel driveway), it will spin a tiny amount as the rig teeters onto 2 wheels, but once it realizes what's going on, I can creep up and the wheels that are off the ground turn exactly with the ones on the ground. When I pull forward and back onto it again, it didn't need to spin before locking up. Then, I can crank the wheel hard right and pull off the pile without any bucking or pressure like a locked front end would do.
In 4 low, there was just no spinning at all. Inch by inch, every tire turns together. It does bind some when you crank the wheel hard coming off, but not as bad as I expected.
On icy roads, when I first bought it, it had crappy street tires, and was running circles around my F150 with snow tires, and with none of the clunking and binding as I go from ice to pavement to ice. The jeep is awesome. And, you can gun it on right turns to fly out into traffic completely smooth.
I think you'll love it. I don't know what parts you need, as my rig is a WK and it came with it. Hopefully, somebody can clue you in. On a WK, I'm told it's easiest to put the lock solenoids on a dash switch, and let the rig drive as a QT2 most of the time. That wouldn't be nearly as fun, but if you have to do bootleg ECM programming or something, maybe you'd consider it.
Just for reference, I saw somebody doing that upgrade on a WK and they got both axles, and I think some computer brain under the back seat, for $500.
07 WK 5.7 QD2, 4" lift, 33X10" tires, M8000s
ARB twin air,Dual AGM group 49, sliders and skids