More than 80 % of the time the "Death Wobble" is caused when the cummins torque monster twists the frame which causes the rails to flex and fatigue. Luckily recently my friend found a fix to this with the Dodge Steering Stabilizer that has completely brought back the steering stability of his truck. So give this fix a try first before you go and spend hundreds of dollars on getting your front end looked at with the end result of driving away and still having the death wobble. Anyway i would would some research and price checks from different companies because there are a lot of different people that make these now. Best of luck !
