The Issue is the input shaft and the motor coupler- to do the job right, both need to be replaced. However, the motor coupler is really the weak point and you could get away with just changing the coupler. To change the input shaft its much more labor intensive.
Some one mentioned bushings, but I think they are talking about the front bushings which is another common failure point, but would have nothing to do with what it seems you are describing.
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