1.) Over the last 3 months or so my 2000 Bravada (95,000m) has started to vibrate pretty harsh when turning at low speeds. It doesn't happen every time, but 80% or so. The wheels shudder when turning sharply, as when into a parking stall; as well as on wider turns - again only at slower speeds. Alignment was fixed two months ago.
2.) For several months now I've been hearing a high pitched whine coming from beneath the floorboard, near the center or rear of the vehicle. It occurs when I'm accelerating, mostly through the city, and never makes the noise(or I can't hear it) when I'm on highways. This noise doesn't always occur, and I can't seem to find any patterns like temperature, type of road, whether I'm pulling something or not, or how fast I'm accelerating. It will make this noise sometimes if I floor it, and sometimes will do so when I gradually speed up. Once I get to about 45 mph the sound subsides. It sounds very harsh though, almost as though I've got a hole in the exhaust - but I know it's not that. I feel like I've maxed out the RPM's even though I'm running around 2-3,000 under a gradual acceleration.
Any answers from anyone?