I have 280K miles on my wife's 1981 300SD with the original flex disks on it. I replaced the flex disks with Lemforder disks as well as the center bearing and hanger. I also replaced the two centering sleeves. I carefully match-marked the two shaft halves so that they went back together with the same orientation.

Everything seems fine except I now have a slight (barely perceptable) vibration in the 65-75 MPH range. It almost feels like I have too much air pressure in the tires. Could this be due to replacing the old flex disks with some new, stiffer flex disks?

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Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 301K (still have)
82 300SD 321K (still have)
84 300D 268K
84 6.2 Diesel GMC Suburban 225K (a whole different story!)