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A drive line vibration is high frequency, feels more like a buzzing. Tire imbalance is lower, more like a constant tapping where you can count each rhythm. 50-70 as you described is almost always tires. You could rotate the tires and see if the vibration changes for a quick at home check.
The people who design the sideways or upside down spin on filter deserve a special place in hell. It certainly used to be easier, my 1990 Cummins was a breeze