Flex discs and u-joints are two different things, and your '85 300Dt has both. The driveshaft couldn't be run in a straight line from the transmission to the differential, so there's a u-joint in the middle. The flex discs are at the connection to the tranny at one end and the differential at the other. Each of these is held on by 4 bolts. The discs are rubber and are sandwiched between the metal plates on the driveshaft and couplings at the tranny/differential. They absorb any vibration and driveline clunks when shifting into drive, reverse, downshifting, etc.
Kevin in Hillsboro, Oregon
1977 240D 315Kmi, Liesel the Diesel who will need driveshaft maintenance at some point
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