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  #1  
Old 04-28-2003, 05:06 PM
ned2683's Avatar
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suspension problem

1984 300SD

when the car reaches about 55-60MPH the front end would shake. this only happens on straight ways. as i turn the steering wheel either left or right (to change lanes) it would go away. and as soon as it is straight again it would start shaking again.

i changed one of my upper control arm (it was loose and i thought that was the problem) but it didn't help.

what else should i look into to make it longtrip worthy?
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198? 300D ???K - Future DD
1989 300TE 285K - traded in '12
1984 300SD 186K - Sold in 08
1978 300SD 330K - Died in 05
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  #2  
Old 04-28-2003, 06:49 PM
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Shimmy is caused by tire balance in almost all cases. Also if the steering shock is shot then it could ADD to the balance problems.
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  #3  
Old 04-29-2003, 12:54 AM
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is there any other suspension components, rods or anything that i could check to see if loose before i go get it aligned?
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198? 300D ???K - Future DD
1989 300TE 285K - traded in '12
1984 300SD 186K - Sold in 08
1978 300SD 330K - Died in 05
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  #4  
Old 04-29-2003, 08:28 AM
LarryBible
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Of course, there are a zillion things in the suspension system that can wear and loosen. You have to raise the car safely and use the three P's, push, pull, pry and prod, to find loose components. You will need to support each lower control arm to check the lower ball joints.

As MB Doc pointed out, the SOURCE of the vibration is wheel or tire problems, most likely imbalance. It is VERY common for the tire stores to use balance weights ONLY on the inboard lip. This is called static balance. Static balancing will prevent the wheel from hopping up and down, but the wheel will wobble unless weights are used inboard AND outboard. This is called dynamic balance.

Wheel imbalance is the SOURCE of the vibration. Bad dampers such as steering stabilizers and shocks or loose suspension joints will worsen the TRANSMISSION of the imbalance.

Balance your wheels PROPERLY, make sure all components are in good shape. Alignment is a good thing, but it will have little or nothing to do with vibration.

Good luck,
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