a rippled type road noise while accelerating between 40-45mph

We won't be able to guess without looking at the car especially if the dealer can't figure it out. Could be an axle, an engine mount, a wheel, etc. Many possibilities but no sense in replacing parts. Bring it to a good independent shop to see if they can get further with the diagnosis. If you need to find a shop near you, use this link https://repairpal.com/repair-shops Alex

Google > chassis ear .. find a repair facility that has one.