Originally Posted by MDBones
I would agree with that if you were looking at QD in its original versions.
QD originally had the QTII TC and used Vari-Lok progressive front and rear diffs. That system split power front to rear and side to side so any one wheel could receive up to 100% of the power.
The second version of QD switched from Vari-Lok to front and rear ELSD's.
In both of those versions I could understand it only being available with the V8.
Today's version of QD is basically QTII with an open front and ELSD rear. It relies on traction control to help make up for the lack of a front ELSD. I fail to see how the 3.6L wouldn't be capable of handling a rear ELSD.
It's not about power.
It's about not having to apply it to get torque. When you can simply let off the brake and have the engine start pulling, it means the other tricks never come into play that might with a smaller engine with less low end grunt.
Smaller engines need more RPMs to get more power. That means potentially developing more wheel spin. An engine that can move a large load at idle speed will move itself over an obstacle with much less gas peddle being applied.
That can help avoid slipping and bogging.