Odd clunk on the 75

[Treecher]

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[NSharpley]

Gearbox mounts perhaps.   Front and / or rear.

[Duk]

My car use to have an odd, intermittent clunk/knock. It wouldn't always happen in the same scenario, but it turned out to be a dead rear engine mount.
The back of the engine would move down just enough so the sump would occasionally knock against the steering rack.

[MD]

The clutch cover could be hitting the bump stop above it fixed to the underside of the transmission tunnel if the gearbox mounts are damaged or loose.

Do not rule out the up/down exhaust mount possibility.

[LukeC]

Check the bolts holding the longitudinal braces under the car are tight. There are six bolts (3 per side). I have seen them loose on a few cars. Causes clunking noises on less than smooth roads.

[giulia_veloce]

Sounds like a De-Dion bush.
Have it all checked by a suiltable Alfa mechanic
Special tools to replace it properly.
I have the tool and done heaps of them.