2014 GMC Sierra 1500 drivetrain & axles problems

I temporarily had no control over the vehicle causing me to have an accident. While driving down a residential street approaching a stop sign intersection I merged into the center of st to pass a trashcan and in the process of returning to my correct position on the road I suddenly had no steering. Panicking from the loss I pressed my brakes an attempt to bring vehicle to a stop but was unsuccessful because the tires began a slide once noticing the traction loss I proceeded to release brakes and reapply in hopes…

Tl* the contact owns a 2014 GMC sierra 1500. While driving approximately 25 MPH downhill with the accelerator pedal released, the vehicle went out of gear and had no acceleration. The contact had to switch to neutral and then to drive in order for the vehicle to perform normally. There were no warning indicators illuminated. The contact also stated that the failure only occurred when the vehicle was traveling below 30 MPH and with the foot off the accelerator and brake pedals. The failure occurred four times.