Hello,
I have an 04 town car with 44K miles and there's objectionable lateral motion of the rear of the car when going over bumps. There was absolutely no lateral motion when I first got the car used at
36K miles. Even just going around a multilevel parking garage, when the car encounters a small bump in the floor at each turn of the garage (where it sharply transitions from level to inclined), the rear shakes sideways. The lateral shake is like an undamped spring that lasts for a few oscillations. This never happened before. It used to be solid with no lateral shake over bumps. The ride is less stable than it used to be over mildly bumpy roads. On the highway it affects straight line stability slightly, but it doesn't seem like trailing arms and dogtracking.The Watt's linkage is supposed to be the only thing restricting the rear axle to vertical motion only. I had it put on the alignment rack to look at the bushings but it was too difficult to shake the rear of the car sideways to see if there was any excessive movement.
When I described the problem to the service advisor at the dealer by mentioning the watt's linkage, he said "what is that?". Then he went on to talk about trailing arms (maybe?), air bags etc.. I then said I was willing to experiment so he suggested I go to the parts counter and get an invoice quote on the parts and he'd figure the labor. The guy at the counter never heard the term "watt's linkage". Couldn't find it in their database. I had to go home and print out diagrams and parts list from alldata and bring it to him, and only then did he have a clue. Then when told I want it replaced, the service advisor refused to do it. I then called customer relations and they called the advisor. The advisor then said they'd install it but that he insisted that it won't solve the problem. I thought it was already understood that I wanted to experiment by spending $400 and see what happens; it's not covered in the premiumCare service plan. If I'm wrong and the problem doesn't go away then that's the process of elimination. I'll have other things looked at.
What else might I look for concerning this problem? I had the shocks replaced with KYB gas-a-just but of course they only damp vertical motion.
Thanks in advance for your help
Ben
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