I was having the same issue with the exhaust hitting the center cross member. I put 3 thick washers on the bolts holding the cross member to the frame on the passenger side. That noise is gone, but I have another noise coming from underneath now. I am going to pull the washers off of the transmission mount and then see how everything lines up. I will check the center support and the front flex disk.This whole mess started when I let the shop on the corner replace the flex disk. I will look and see if they put it in backwards or something blatantly stupid. Is there any way that something got out of alignment when I jacked up the transmission to get the mount off?

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1972 SILVER 280SE
1989 SILVER 300 SEL
1984 DARK BLUE 300D EURO