he only reported no vibration with the 16" wheels on the front and beyond that with different wheel size configurations just changed the magnitude of the vibration, not the starting speed of the vibration.

so maybe it is all in his wheel/tire combos, I wonder when they were last balanced and even if they are balanced what their runout is. but on the same token he has found a config to almost completely eliminate the shaking, so maybe that can be used to help locate on which end of the car the shaking is located.

I was just trying to get some info as to the condition of his axles because I know that can cause shaking at strange speeds AND clunking at low speeds (especially reverse)

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'81 300D - swapped to a 617.951 turbo motor with a 150 amp alt.