The contact owns a 2020 Ram 1500. The contact stated while driving with the cruise control feature enabled at 70 MPH, the contact noticed a loud banging sound. The contact noticed in the rearview mirror that large parts were flying from underneath the rear of the vehicle. The contact drove the vehicle to the shoulder of the road. The contact stated that the vehicle independently rolled backward. The contact activated the parking brake to stop the vehicle. The vehicle was towed to the dealer where it was diagnosed with a failed drive shaft and damaged rear end. The contact was informed that the driveshaft and the rear of the vehicle needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and a case was filed. The failure mileage was approximately 62,400.