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Re: drive shaft vibrations and ujoints TR250 TR6

To: Don Malling <dmallin@attglobal.net>
Subject: Re: drive shaft vibrations and ujoints TR250 TR6
From: David Brady <dmb993@earthlink.net>
Date: Fri, 19 Mar 2004 17:31:31 -0500
Hi Don,

I just had my driveshaft dynamically spun
balanced. If you rotate the yokes 180deg, you
may need to re-balanced the driveshaft - this was
confirmed by my driveshaft shop. This may
be the imbalance concerns that your mechanic
is referring to. Certainly, 180deg rotation
will not effect the inherent non-constant
velocity characteristics of a u-joint.

Dave Brady
68 TR250 CD8124L


Don Malling wrote:

> My local non-LBC mechanic told me that I can risk the chance of drive 
> shaft vibrations if the drive shaft *flange* yokes are installed 180 
> out of phase with respect to their original orientation.
>
> I understood from Bentley and threads on this lists that the yoke 
> halves that are part of the drive shaft had to be at the same angle 
> (the yokes of both ends of the drive shaft had to be in the same 
> plane), but I never heard that one could not be 180 degrees off from 
> it's original orientation. I also never heard the flange end of the 
> yokes could not be reinstalled 180 degrees off with respect to their 
> original orientation.
>
> Any comments?
>
> I'm concerned that I have already removed the u-joints from the IRS 
> axles and have lost track of the original orientation of the u-joint 
> yokes with respect to being 180 degrees one way or the other.
>
> Any comments?
>
> Did this make any sense?
>
> Don Malling





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