2008 Jeep Wrangler 4-DR 4X4 steering problems

Driving home from work on a moderately hot day (91 deg at start of drive, 80 deg at time of incident about 55 minutes after start), some stop-n-go traffic first 40 minutes, then a steady normal climb into foothills (from about 5400' to 8200') on paved roads, as vehicle was turning right at a y-intersection at top of a hill, a large bang was heard in the engine compartment followed by excessive amounts of grey smoke emanating from same.

While on the highway going at a speed 55MPH or higher, the car will go over a small bump while on a slight hill or turn, and begin to violently shake the car, only stopping when the car has been slowed to a stop - requiring the vehicle to pull off the highway to stop the shaking. Due to the violent wobble, the car is difficult to control, and feels as though it could create a significant accident at high mile per hour speeds, or concerns about causing an accident on the highway due to the vehicle needing to pull…