Not something I want a mechanic or doctor to tell me. Here's the problem. If I'm above 35 mph or so and start slowing down, either by just coasting or by braking, I feel a vibration in the wheel, brake pedal, and seat. Slower I go, the worse it gets. And it sounds and feels like I'm driving over rumble strips. When I'm coasting and it's vibrating, applying the brakes makes it a little worse. When it's vibrating and I begin to accelerate, the vibration stops. I had the wheels off and the rotors look fine. I had lots of play in the drag link (connects to the pitman arm) and replaced that and it made no difference. I had the problem when I had on my summer tires and the problem remains since I switched over to my winter tires. The mechanic who took a test drive with me said the symptoms didn't seem like they were tied to rotors, wheel bearings, or u-joints. The place/mechanic specializes in drivetrains and they've done good work for me in the past (ball joints, etc.). The driver's side hub assembly and rotor are 2 years old. The passenger's side is probably the original. Truck has about 270,000 miles on it and I bought it in 2001 with 90,000 on it. The soonest I can get it into the shop is Tuesday next week. Any ideas on what it could be or what I could check myself (limited mechanical ability but haven't screwed anything up yet)?