Wick --
You had the conversion done -- Did it vibrate before the conversion?
If not -- It's most likely drive line.
An out of alignment will usually only cause accelerated tire wear. A severly mis-alligned configuration will cause crabbing.
But -- An out of balanced drive line will cause vibration. Also a dry/worn out carrier bearing will cause noise/vibration.
I'd suggest -- Either taking it to a drive line speciality shop and have them re-balance each drive shaft -- Or you take them off and take to a drive line shop for this work.
If the vibration just happened one day -- You probably just spit a balance weight off one shaft.
As far as noise goes -- What you attempted to do is neither valid or safe -- That being -- Jacking it up and applying power to the drives.
Dave
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