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If the vibration starts at a certain speed and gets worse as speed increases no matter which gear, it is not going to be engine rpm related.
If it is vibrating at a speed even when coasting clutch in it will not be clutch or trans up to the output shaft.
If steering wheel shakes or vibrates it's front end. If seats and floor shakes it is rear.
I had vibration above 70 that had two conditions, increased with speed even with clutch in. And increase with magnitude when accelerating hard.
My findings where tire run out was excessive on rear tires as they rotated on the rims. Once I installed new the vibration went to higher speed but was still there. I found the front driveshaft bolts did not hold and had to replace my one piece driveshaft.
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