There is this comment in the M3W Buyer's Guide about teeth jumping that may, or may not, be relevant to owners wondering if they have an issue:
A loud bang when accelerating from standstill is caused by excessive
vertical movement of the bevel box NVH bracket causing it to hit the
chassis. This is often mistakenly diagnosed as the drive belt slipping a
tooth on the drive sprocket. Morgan’s solution for this is to run very
tight drive belt tension.
