Usually with a balance problem you can "drive through" it. Little or no vibration until, say, 30 mph, then it gets better. Then at 45 or 60 you notice it to be greater again. That is due to to the harmonics. It could be, balance, radial (localized high spot) or lateral (side to side wobble) .due to uneven wear. Balancing won't correct a radial or lateral problem.
From your description I would lean to a wheel bearing or u joint on a rear wheel drive. But that is just a wild azz guess.
Can you feel the vibration in the steering wheel or in the seat of your pants.
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