I had a Detroit Truetrac installed on the rear of my 2006 Liberty by a Jeep dealership. I just used the stock 3.55 rear axle ratio. Before the installation, I was in some muddy soil and one of the rear tires slipped. I was able to get out by putting it into 4x4 low. After the installation, for normal muddy driving, loose gravel, and wet road conditions, I just drive normally and I can hear the alternate gripping of each rear tire. Sometimes I just put my Jeep into 4x4 now just to hear that whine of the 6 speed manual transmission (in the appropriate conditions, of course). The design of the Truetrac is similar to the "Torsen" LSD on another vehicle I used to drive for 16 years with no problems. Both are all gear and maintenance free. The Truetrac is fine for the type of driving I do. It was a good investment, in my opinion. The part number for my Truetrac was Eaton (Detroit Truetrac) Part # 52688. A few additional parts were required to make it a wear free installation, but the dealership took care of that for a 2006 model. They, at first, suggested an "ELocker", but I wanted the all gear Truetrac and knew from experience that I would not have problems with it and it was automatic. The ELocker would have to be manually activated. I needed something that activated by itself quickly for the type of driving I wanted.