Hello,

Car: 84 California 300SD

Wondering if anyone knows what is causing my vibration problem. At approx 60-80 mph when i let go of the accelerator pedal suddenly, I get this hummig noise coming from underneath the car..from the chasis...feels like something in the driveline is rubbing. It goes away, if the accelerator is depressed again.

I checked the condition of the transmission mount, that looks okay and none of the exhaust hangers are loose.

Only recent driveline work was a new differential installed about 6-8 months ago.

Any ideas on what to check?

Thanks

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1) 84 300SD 285K+ Miles (Ver Calif)
2) 84 300SD 175K+ Miles (Ver Federal)