Just returned from a great winter trip up to crater lake in oregon for the new years holiday, but going through the cascades mountains I developed (just noticed?) a strong vibration at highway speeds, almost a knocking while going uphill. Specifically, felt a strong vibration through the steering wheel and floor board while in 5th/6th gear going up hill while around 2250-3000rpm (60-75mph). Almost felt like the engine dropped a cylinder, but outside of knocking the engine was strong and if I let off the throttle the vibration stopped immediately. So far, LCA's, engine mount, torque mount, struts, and end links have been replaced. I suspect either an inner cv joint gone bad or the transmission mount is shot, but I could use everyone's input!