chattering sound from drive train
 

while driving down the road,i lift the accelorator,then suddenly i hear a chain like chattering,it sounds like its coming from the drive shaft,could this be a universal joint,or does an 89 300ce not have any,i see rubber discs between prop shaft,what could cause this noise when i lift accelorater. when i reapply accelorator the noise disappears.you only hear it when the cars slowing down.itsounds as if something is scraping the prop shaft??

couplings
 

flex coupling giving way . there will be some vibration too very soon
mak

where is the flex coupling located?,is it part of the prop shaft?

two couplings
 

flex coupling joins the transmission and propeller shaft at front end .there is a similar one at rear end.front one will be broken.
mak