Well, I've had to start over on this job because the rumbling noise and vibration came back after the car had been run on the highway.

Now it seems to me that the shock is pretty loose where it spends most of its time traveling. The idler pully itself is fairly tight, but the pivot arm (tension lever) is a little loose side-to-side.

So, now I'm going to replace the rest of these parts and hopefully be done with it for awhile. Already have the shock and the pully. Yep - have to order the tension lever and have the car parked until it arrives.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles