Was driving at about 40 mph with cruise control on, when my passenger and I noticed extreme vibrations and noises with. Began slowing to turn into a gas station just ahead when the clunking became so violent the front of the vehicle was bouncing. As I turned into the gas station, there was a loud bang, smoke billowed from the hood, and the engine stalled leaving me with no power steering. I turned as hard as I could to avoid gas pumps and people fueling their cars, and ended up running up a curb with no power to steer away. No warning lights came on until I came to a stop. Smoke and oil continued running from the front of my truck for several minutes. I feel fortunate to have walked away from such a violent breakdown. I am told the truck needs a new engine and transmission resulting from a broken crankshaft, and have been refused any warranty or good will assistance. I was given a quote for $37,000. Thought it was a joke, but then again this whole experience has been hard to accept as reality.