Resonating vibration

Maybe this will help.
All 5.9 and 360 need the external weight.

A 360 calculates out to 5.9L but in Mopar world, they are DIFFERENT engines and need DIFFERENT weight. The holes drilled for balance in Magnum 5.9 flywheels are much smaller than the holes in a 360 flywheel.

Make sure you get the balance system for a 5.9 if you're running the Magnum 5.9, not the weight for a 360/5.9, because some sites will list it that way.

Mopar sure created a cluster **** with this deal.