[rblong]

Michael - Thanks. I agree with your suggestions. I had a flywheel out once and caused the same thing, but it was at higher rpms only. I know a rotating asembly, is a rotating assembly, etc, but thought I would post it before going deeper. I actually have a vibration analysis/balancing tool I use in my business on all sorts of rotating assemblies. Do you know if anyone publishes recommended vibrations levels for FE motors? This is my first expence with Ford motors and I don't knowwhat externally balanced means. I am accustomed to balancing every components while assembling.

Bruce