I have a 2006 honda ridgeline that has a shimmy at highway speed only starts at 73 74 and does not stop. I have put new driveshaft on it and new tierods inner and outer, new motor mounts turned front rotors ,alignment,and new tires with good balance am at a lose!

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Is there any evidenced or knowledge of this vehicle having been in an accident? It's possible that a half shaft is bent (although seemingly unlikely) or maybe the carrier bearing for the driveshaft is bad.

If none of the parts you replaced made a difference, I'd be considering bearings. Is the shimmy felt mostly in the body of the vehicle or in the steering wheel? If mostly in the body, the issue is probably related to the rear axle. If the steering wheel shakes, the issue is likely related to the front axle.
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