And that is the advantage of using the guibo's (guibii?) opposed to universal joints. They are much more forgiving in regards to vibration absorption.

An "upgrade" you might consider is the filling of the open space of the transmission mount with polyurethane. I use Loctite Pro Line S30 Roof and Flashing sealant.

Tape one side, fill the voids completely, let cure, remove tape and install. It can take up to one week for the sealant to thoroughly cure.

If you use any higher rating (the "30" number) you might end up with too stiff of a mount which can transmit vibrations.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now

Something I did to extend flex disc life. Removed the drive shaft on my ‘71 and inspected the rubber for cracks... which it had... but nothing torn through. So I cleaned it up real good with acetone and then coated it with Silicone type II... evenly distributed around the entire rubberized area.

Ha! I like this!
I think I'll do that when it gets here.
Thanks a lot.

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1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT

This is good, too late now as I already took apart and reassembled my D-shaft.

Thank you though.

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1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT