I have a 2002 ford f250 7.3 diesel with a drive shaft vibration at around 45mph. It has a 2 piece drive shaft. The large rubber bushing around the drive shaft in carrier housing is somewhat collapsed on the bottom. could this be the problem or does this rubber bushing need to be replaced anyway?

Hello, i have a chevrolet dually, the carrier bearing, in mine was doing this, i took it apart, pulled both driveshafts apart then took carrier bearing off, the bearing inside was dry, plus they had a bblue look to them, bearings was bad, plus rubber around the bearing was dry rotted, there is know way of greasing these bearings because they are sealed, i pull bobcats, tractors, with mine if you use it for a lot of heavy pulling, they dont last a long time, chevrolets carrier bearing is all made together, bearing and rubber is made together, on mine, seems like i paid about 35.00 dollars for mine, spray some wd-40 around driveshaft where it goes into bearing, i had to take a hammer to mine to get it off front drive shaft, it was stuck pretty bad.