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What do you mean by "control arm?" I don't see that as a component of the rear suspension -- do you mean the track rod (aka panhard rod)? The reason I ask is that my '81 has developed a nasty vibration. All three U-joints were replaced last fall. I should have had the center bearing done at the same time, but didn't. On the other hand, it feels fairly solid. I replaced all four bushings in the torque rods, which changed/reduced the vibration, but didn't eliminate it. Vibration seems worst at about 35-40 and around 55 mph, but sometimes goes away or at least isn't so bad.
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'81 GLT 245 @ 259K; '83 DL 175K
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