Does a supercustom have a harmonic pulley?

Driving under load.. eg up hill get a vibrating sound. On my delica it was the pulley wheel that was a harmonic balancer ( simply put it was made of soft rubber on inside to stop harsh vibration) but it was so old the rubber broke down and had the opposite effect. Replacing it sort problem.

If not this, any other ideas. Thx

Probably a worn out engine mount or gear box mount .

Also check all the universal joints!

Yes, it has a harmonic balancer. The one on mine failed and the rubber debonded. Was about £70 for a replacement