my driveline has started to vibrate some as well.

recently the flex boot tore and made a terrible noise as it flapped about.

new boot listed for $8.86 @ my local dealer, pn: 202-411-04-97

new unit is more plastic-y but should function the same

waiting for more agreeable weather to crawl under car to replace & investigate source of vibration as flex discs, bearing & center support are reasonably new & of good quality.

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1991 300D