David, I had the same problem and it's the gearlever touching the propshaft.
See post below on how to fix it.

https://www.talkmorgan.com/ubbthreads.php/topics/527537/gearlever-touching-the-propshaft


Dirk

1993 Morgan +4 (Connaught Green)
2009 Mini Cooper D
2024 Mercedes GLC
1994 Ford Motorhome