I had a metal on metal sound that went away once i replaced the motor mounts (the second time). turns out that the aftermarket mounts i purchased weren't the best and some part of the exhaust was hitting the metal seat of the mount.

good luck

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1979 Thistle Green 300D 272,xxx miles
1984 Orient Red 300 D 4 spd Euro Import - 189,xxx miles
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Lofat Productions
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