2.3-16 vibration dampner

[beamonk]

I have a 5-speed 2.3-16. The front of the driveshaft has a doughnut around it which, I guess,is to help with vibrations. This is not the disc between the transmission and the driveshaft. The doughnut is starting to fall apart, can you replace the doughnut or do you have to replace the whole front driveshaft. My mechanic said he has seen this problen with a manuel diesel and he said he could only get the part with the driveshaft. He took the doughnut off and left it off with no problems. Any suggestions. Thanks