2006 Dodge Ram 1500 brakes problems

Approx. In 2012 I filed a complaint that the rear pinion gear had snapped on my truck. The dealership recommended installing a new / used rear end. I had the used rear end installed. On 5-7-2015 while on the highway the axle on the rear end abruptly broke. This occurred at approx. 60 MPH. Almost causing a catastrophe. The wheel broke away as well as the brake caliper, thus loosing my brakes. As a result damage to the body also occurred.

My 2006 ram 1500 2 wheel drive, big horn edition shakes while braking at approximately 70 MPH until it slows to approximately 55 MPH. Noone can find the problem. The truck shakes so badly, it feels like the front end is going to shake off! I have replace all 4 tires, had wheels balanced, replaced all 4 rotors, brakes, calipers, inner and outer tierods, front wheel hubs, shocks and the truck still shakes so bad that im scared I will be thrown into oncoming traffic if I had to stop fast....