Re: [Chrysler300] 300D Vibration

[Edward Mills Antique Tractors <millserat@xxxxxxxxxxxxx>]

If the problem is new with the tires, I would look there. Typically tire 
vibration due to balance problems are frequency (speed) driven but the 
harmonic tends to be around 60-70 MPH on most passenger tires and 
critical speed increases with tire diameter. 45-50 would be a bit low 
but still worth checking balance - but FIRST I would jack it up and spin 
fronts and look for out of round tire or wheel. Best is probably to put 
a brick or some reference at edge of tread and see if distance changes 
as tire rotates - probably should be less than 1/8 inch variation. If 
fronts are good, you could swap rears to front to see if the problem 
stays same of changes and of course look for out-of-round before you put 
car back down. Then take it back to where tires were balanced and ask 
them to recheck - its possible they made a mistake or you threw a weight 
- but look for large amounts of weights as they tend to indicate tire / 
wheel problems. Its also possible tires rotated on wheel - the old 15's 
tend to fit looser than the 14's and I have seen it happen on race cars 
- typically when too much tire lube was used AND too much HP applied 
suddenly - but as I said the older wheels are looser fit and would be 
more prone to such a problem. .


pennsy300@xxxxxxx wrote:
>
>
> My 300D convert (with the new Coker radials) has a significant vibration,
> but only between 45 and 50 mph. Above or below this speed all is just
> perfect. My question: Is this characteristic typical of tire problems, 
> wheel
> alignment, or something else? I sure would like to get it fixed. Thanx
> for whatever help is out there. Terry McTaggart
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> [Non-text portions of this message have been removed]
>
> 




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