Very bad Front end shaking vibration between 60 and 80 on 2001 Nissan Pathfinder

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It is rear wheel drive and I have replaced the front wheel inner and outer bearings, and the rack and pinion assembly also had the front end aligned and tires balanced twice. I still get a very bad shaking at the steering wheel mostly between 65 and 75. What else can it be?
(1) Answer
(1) Comments
check tires for out of round or balancing
Thanks, probably out of round since the tires have been balanced several times.