Why the ARB was the QT2 not getting the job done.
Fair question...as you may know QT2 is a brake assisted traction control system. It does not have a limited slip or electronic lockers like QD2. QD2 has front and rear electronic lockers.
For 75% of what I do the QT2 system works fine. It is that other 25% that I needed a locker...rock climbing at Uwharrie, several red mud situations where I had to go full throttle with tires spinning to get through.
There is a significant lag time in the brake assist system which is detrimental when you need traction right now. Also the QT2 system has a tendency to create a rubber band effect on the chain in the transfer case. The chain goes slack and then tightens..which may cause breakage. If you are quick on the brakes, left foot brake or even use the emergency brake you may get QT2 to work, but that is a a lot going on when you are trying not to put a wheel wrong.
So for me the addition of a rear locker will pretty much complete my Jeep and provide me that little bit of assurance. I will probably keep the Jeep in 4Hi and use the locker for the majority of terrain. For the rest I will use 4LO and the locker.
And lastly I would love to have a Rubicon, but I do not want monthly payments. It is cheaper in the long run to add a rear locker to my CRD than invest in a new or new to me Rubicon.