1996 Toyota 4Runner vibrates when accelerating or above 60

Shakes or Wobbles problem
1996 Toyota 4Runner Two Wheel Drive Automatic 105000 miles

I have a 1996 Toyota Runner SR5. A couple of days ago I ran over a fist-sized rock going 30 mph. Since then it vibrates a lot when I'm on the freeway going over 55 mph. It vibrates when I accelerate at low speeds or when I go uphill, too. I thought the wheels might need balancing because it doesn't seem to be an alignment problem. My SUV had the front wheel alignment and all wheels balanced in 3/09. When I'm coasting or not accelerating it doesn't vibrate. The steering wheel vibrates a little but not much. Also, I noticed it seems hot under the hood or car after driving 20 min but the temperature gauge is in between Cold and Hot.