You might have to use offset dowels.

If you were racing you would do something but for a driver I can't believe .030 of misalignment of the transmission input would have the effect you get.  I couldn't believe the sound and vibe you get above 75 mph.  You could move it toward 8:00 by .010 but I don't think will cure the issue.

The trans manufacturer called out an allowable amount of run out or whatever the term is. Seems like it was .005 per side. Don’t quote me. I watched a few videos to get the hang of it.

From the reading I did, premature failure of the input shaft was the concern of improper alignment, not vibration.


I bought offset dowel pins from RobbMc performance. Once the alignment was set, the pins could be locked in place.

Rudi wrote:

Just a thought, did you verify the hole is round?

 
All I can do is see if several measurements across the hole are same. It fits nice and snug on the bearing retainer. Bell also fits snug on dowels in the block.

Seems like offset dowels only come in .007, .014, .021”

I agree with Bolted.  Off center there would cause input shaft bearing failure before anything else, I'd think.  Vibration, not so much with the amounts you are reading.  But then, I used to mess with Model A's.
 

Seems like to me that input shaft misalignment could also cause clutch chatter/failure.

Since the clutch is indexed to the flywheel when the pressure plate is bolted down, the transmission is not part of the equation.  Then once you slip the transmission into place and bolt it up, any misalignment will be putting pressure on the input shaft bearing.  However, once you repress the clutch the first time, the pressure should neutralize on the clutch itself and instead be shared between the input bearing/bushing and the transmission input shaft bearing.  It would seem to me that distant between these two bearing points is great enough that the play in the input shaft is already enough to absorb it.  Of course, I don't actually know.  This is just how I see it.  Regardless, I don't think it would cause any clutch chatter.

The disc would be slightly off center from the flywheel, but only a few thousandths. Every little bit helps when trying to eliminate chatter and vibration.
I agree the small misalignment I have is not causing my 80mph+ vibration.
Trying to leave no stone unturned.

What doesn’t look right is in the first picture you are unable to repeat the same numbers.  Second is off so much from the first that I would question the setup/method of measuring.   Something is not stable. Unless you are getting repeatable numbers.   Some times to much of the indicator can cause some movement it the way it’s mounted but it doesn’t look like that is the case here.

Tranny is back in.

BobE wrote:

RTM wrote:

What doesn’t look right is in the first picture you are unable to repeat the same numbers. Second is off so much from the first that I would question the setup/method of measuring. Something is not stable. Unless you are getting repeatable numbers. Some times to much of the indicator can cause some movement it the way it’s mounted but it doesn’t look like that is the case here.

I agree w/RTM regarding not getting repeatable numbers.  I had this happen to me when checking piston to valve clearances until I established a more solid mounting for the dial indicator.

 

Agreed
That is why the second picture with a single set of numbers was a new setup. I did two revolutions and got same numbers.