Engine Vibration '89 Town Car

Hello forum, my first post here....question: I have an '89 Town Car with roughly 130,000 mi., in great condition. I've owned the vehicle for 16 years, it has been immaculately maintained. I just had a complete tune up/checkup etc., with transmission service. I'm noticing a vibration at about 65 mph up that wasn't there before. It's not hard, but noticeable. It's fast, like a vibrator, and comes and goes every few seconds. The engine isn't missing, at least that I'm aware of, smooth at idle anyway. I've also noticed a bit of a jump in oil consumption, about 1/2 qt. every other week, I used to not put anything in it for months. This vibration goes away after slowing down. I'm not sure what to think of it, anyone have any ideas ??

did you have the trans flushed? If so, they might not have put the shudder guard in it. I would recommended Lucas Transmission Treatment.

Shutter Guard ?? You lost me on that one..... can you explain ?? Thanks.