[Roadsters] Vibration

[Eddie]

Rule of thumb in diagnosing problems:

1) 99% of the time, if a problem shows up right after you've changed 
something, whatever you've changed is what's causing the problem.

2) Don't start changing other things until you've determined that what 
you changed initially is definitely NOT the cause of the new problem.  
Otherwise, you jut increase the potential to cause more issues and make 
the situation even harder to diagnose.



Questions regarding your situation:

Was the vibration there before you changed the tranny mount from the old 
crummy one to the new prothane mount?  Yes or No?

Is it possible when you reinstalled the new mount, etc, that somehow the 
tranny is now NOT perfectly in line with the rear axle?  (If the trans 
isn't lined up straight, that could easily cause a wobble.) 

Eddie






Mark wrote:
>  I had the engine trans out of my 70 SRL and noticed the trans mount 
> was in dire need of replacement.  I used the Prothane mount as it 
> seemed the closest to the stock thickness.  It was a fairly painless 
> swap....but now I have this vibration that starts to be noticeable at 
> about 40 MPH - it gets smoother as speed goes up but it is still 
> noticeable....does not change with the clutch in or the trans out of 
> gear and coasting.  It is very apparent for in the 40-55 MPH range.  
> My first reaction was to replace the u-joints, absolutely no change.  
> So I am now wondering if anyone has a stock 5-speed trans mount they 
> could measure for thickness?   Mine was so far gone I could not 
> salvage the pieces.....!  Or could this be a drive shaft balance problem?
>
> Mark
> -Ohio
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