It is possible to assemble the driveshaft incorrectly. The spline should be
assembled so that the yokes on either end are turned the same way. It can
vibrate if not assembled correctly. It's a velocity thing.
Rotating the driveshaft flange in relation to the trans or diff flange should
not make a difference unless both are out of true. Of course that is a very
real possibility.
Richard Good
Mark Hooper wrote:
> Hi Dick:
>
> I replaced the original transmission with an O/D unit, so the punches don't
> mean a whole lot for me either. What I cannot remember is if I stupidly
> assembled the propshaft correctly, or if it is even possible to assemble it
> incorrectly. I do have a harsh vibration that gets worse with speed, felt
> right through the gear shift handle.
>
> Mark
>
> -----Original Message-----
> From: tr6taylor@webtv.net [mailto:tr6taylor@webtv.net]
> Sent: Tuesday, March 25, 2003 2:44 PM
> To: mhooper@pix-cinema.com
> Cc: pjgraffam@juno.com; 6pack@autox.team.net
> Subject: RE: Prop/driveshaft vibration
>
> Hi, Mark---The Bentley manual makes reference to "marking" the prop
> shaft flanges to their counterparts at the transmission tail flange, and
> the differential drive flange. I found center punch marks on my car on
> these flanges and assumed this is what Bentley was referring to. (I have
> always used these) However, I have not seen these on other TR's that
> have come my way for repair. I would think the prop shaft could be
> balanced as a unit, given that it has a weight tacked on. Again, I
> assume this was to balance it.
>
> I have recently installed another diff, and of course it had its own
> drive flange. If it would have had a "mark" on it, it would be
> meaningless. I haven't had it up to any significant road speed yet, to
> see if there's any vibration. (I really don't expect any)
>
> I don't know what changing the prop shaft U-joints might do to upset
> this shaft balance, or if the factory includes these in their initial
> balancing. Nor could I explain why moving the diff tail flange 180 deg.
> helped one owner cure his vibration problem.
>
> Dick
> '73
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