Hello, first time posting here. 2018 Outback Ltd, has a "whole car" vibration or wobble from around 55 - 65 mph. Slower or faster it is not present. Only happens under load; if coasting it goes away. Tires balanced, alignment checked, happens on summer tires and winter tires. Does not come through steering wheel, but whole car has a noticeable vibration, hard to pinpoint source. Dealer replaced drive shaft $1100. Didn't solve problem, they now want to replace front axles one at a time $750 each. Got tired of spending money and have lived with it for the last year or so. Suggestions?