I've had this problem for a while, but it's getting louder. Under load, accelerating or decelerating, there's no symptom. If I unload the drivetrain by pushing slightly on the accelerator, for instance when coming down a slight grade, I get a consistent thump. On a long downhill grade like on I-70 coming down into Denver, I can get the backseat passengers to think there's a helicopter hovering over the right rear of the car. The noise is definitely coming from the right side so I'm almost certain it's not the flexdiscs. When I jack the back wheels up, I can get a slight top to bottom wiggle on the right wheel, but not the left. I'm thinking it's the right rear wheel bearing. (Another member had a similar problem on a TD in the past) Got a quote from Startech, the local independent MB shop for $410 parts and labor. This seems reasonable to me. Is my hypothesis correct? Opinions?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13