Originally Posted by GreggM
Purchased a 2005 Liberty for my wife a few weeks ago. Overall we are happy with the car. It has under 60K on it. Liberty has the 3.7 4wd and is in good shape. When braking and coming to a full stop there appears to be a thud in the back. It's nothing i've heard before. Any clues will help.
With the car in neutral on a flat surface, get someone to rock the car forward and back, while you watch the rear suspension. If there is a lot of play in the rear tri-link (rear upper control arm, big boomerang thing with a ball joint... attaches to the rear diff), then you need to replace it. It could also be the lower control arm bushings (two for each arm).
It could be the U-joint too, but you would likely have vibrations and other noises on acceleration.