Date registered: Nov 2006
Vehicle: '84 300DT, '97 S320
Location: Fayetteville, GA
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Sorry for no good suggestion, but I have a rumble in my '84 300DT (370k mi.) starting at 55 mph. I had the rear axles replaced, mostly because the right's inner boot had broke open some time ago, and I put a Speedi-Boot over it that I had left over from another vehicle, so it was just a temp fix. Anyway, the rumble was still there after the axle replacements, but no difference in the rumble -- starts at the same speed, same frequency. My center support has a little crack in the rubber, but not sure how little 'til I replace it. The one on my '73 220D had a rumble after reaching a certain speed, and that was the support that time. Weird that I replaced that at about 100K mi and 8-yrs, and this one in the 300DT has 370K mi and is 26-yrs old. I was/am not the orig owner of either car, but I'm sure neither one had the support replaced before I bought them. The 220D had more winter exposure (1st 4 yrs in Germany, then 5 in Nebraska (where I replaced the support), then TX and GA 'til 240K mi. The 300DT, 1st 11 yrs and 103K mi in FL, then GA (with me).
I'll get the support replaced n another few weeks -- doing the oil cooler lines this weekend. If the rumble goes away, then we'll know that a new support can be a cure, though it didn't fix yours.
'73 220D White "White Knight" ('77-'06, 240K mi; floorboards rusted; gone to MB Heaven)
'84 300D Turbo Maroon "Raspberry" ('95-present, 375K mi; daughter named him)
'95 Merc Villager "Blueberry2" ('00-present, 252K mi-2nd engine-tip of crankshaft broke at 170K)
'97 S320 LWB Black "Ebony" (2010-present, 217K; bought at 204K mi)
'07 Dark-Green GMC Yukon Denali "Jade" (Added Apr 2011 - 104K)
Last edited by MB220D300D; 09-18-2010 at 10:29 PM.