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Re: drive shaft vibrations and ujoints TR250 TR6

To: "'6-Pack'" <6pack@autox.team.net>, triumphs@autox.team.net
Subject: Re: drive shaft vibrations and ujoints TR250 TR6
From: Don Malling <dmallin@attglobal.net>
Date: Sat, 20 Mar 2004 09:13:10 -0500
References: <000201c40e39$5b58fda0$0200a8c0@Hugh>
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0
Thanks to all who have responded.

But to tell the truth I am confused by some of the replies. I'll bet it 
is because my question was not clear.

In all cases, either drive shaft or axles, the yoke end that is attached 
to the shaft is in the correct orientation. In the case of the axles the 
spline goes together only one way, as Hugh pointed out, and in the case 
of the drive shaft, I have not moved the yoke ends that are attached to 
the drive shaft.

I am only asking about the flange yoke ends that are connected to the 
shafts by the ujoint.

I did not think it made any difference if these flanges were rotated 180 
degrees when I reassembled the ujoints. I'm still not sure if it does 
make a difference. Probably the best suggestion is just install the 
ujoints have them balanced anyway -- not sure what that costs.

One person responded and said that they had a vibration and solved it by 
  unbolting the drive shaft flange and the mating differential flange 
and rotating the drive shaft 180 degrees. I guess I have heard that one 
should mark the drive shaft flanges and diff-tranny ends for later 
reassembly.

Brings up a question -- I'm putting in a new OD tranny. What to do then? 
  Just bolt it up and hope for the best? There's only four different 
possibilities I guess, but what if the vibration is caused by a 
combination of both the diff end and tranny end -- 16 possibilities. 
Hmmm....

I don't understand how it could possibly make any difference how the 
balanced drive shaft gets bolted up to the diff and tranny. Is the 
tranny and diff out of balance and does the drive shaft compensate for 
this in some way?? I thought drive shaft was balanced out of the car. If 
it's balanced, how could it make any difference how it was bolted into 
the car? This makes no sense. If the drive shaft compensates for an out 
of balance diff and/or trany then the drive shaft must be "balanced" out 
of balance in just the right way. Something doesn't compute here. Did 
the factory just keep unbolting and bolting them 16 different times (OK 
8 times on average) until they got it right? I think I'm starting to see 
the blue screen....

Don Malling






Hugh Barber wrote:
> Don Malling wrote:
> 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.
> 
> Don,
> 
> Are you talking about the driveshaft or the half-shafts (axles)?  The
> half-shafts have a "key" in the splines that will only let the two halves go
> together one way.
> 
> Hugh Barber
> Hollister, Ca
> '73 TR6





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