My 82 w126 300sd seems to have developed a bad driveline vibration....but weird.

If I am driving at 65mph, on a flat surface, it seems fine. Head down a hill, and it starts vibrating, and feels like it's from the rear. Slow down a little and it appears to get worse while deccelearting.....


Flex disks? I'd pop under and take a look, but it's been snowing here since Thursday night....they say it should stop in the next day or so.

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79 300SD - $50 out of pocket purchase
03 Dodge Ram 3500 CTD
2003 VW Jetta TDI

Sounds like it's the flex disks or center bearing.

Axle half shafts can also make a noise/vibration.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles

What exactly would I be looking for with the axle shafts?

Flex disks? - I think I know what to look for with them, but I imagine they're cheap enough to replace and not too time consuming.

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79 300SD - $50 out of pocket purchase
03 Dodge Ram 3500 CTD
2003 VW Jetta TDI

I would check the center bearing first, crawl up under the car, inspect visually, try to rotate the drive shaft, jiggle, feel for any play. May be difficult to do so, as the SD has a plate bolted below the drive shaft. While you're there, look at the flex disc's, both of 'em, they will be obvious.

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83 SD

84 CD