1987 420sel 200,000 +

had rubber under front end replaced
wheel bearings
brand new brake pads and rotors are good

i shake at 55 and above....could it be a steering box issue/adjustment?

what am i missing? please help....

lyle

Tires, tire pressure, alignment... My bet is that you have a tire out of round. I have a set of Michelins with lots of tread on my 300SEL but they have been on the car for a long time and have flat spotted and cause some vibration at 80+

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6

Agreed, TIRES. And then find the cause of the tire wear - old age or bad shocks.

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Don't Chrome them; polish them

Replace steering damper.

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85 300 SD ~ 115K
82 500 SEC Euro ??K
78 450SL 164K

...and idler arm...usually overlooked but quite the culprit if worn...plus, replacement is inexpensive.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car

wheels may be bent...this typically is what causes shake at highway speeds.

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1990 560 SEL- "Goldielocks"
1984 300SD TurboDiesel- "Ole' Blue"