I had this same problem, vib from 55-70 mph and went away if faster or slower and it didn't matter if the trans. was in 3rd or 4th gear. Had stock 14" rally II wheels checked for balance and checked okay, but when I swapped wheels to 17" Cragar SS, the vibration went away completely. Don't know if the angles changed with the wheel swap, or if it was the wheels themselves. Hope this helps.
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