I concur with all of the above! When I had my Jeep, I called to order two of these to lock both axles. The guy on the phone urged me to just get one for the front, had no doubts that's all I would need.
It took me 2 hours to install and made a huge difference off-road, with no noticeable issues on road in a daily driver.

I'm gettin' one.............

Brad