NHTSA Complaint #11719049 — 2016 FORD F-150

I was driving down the road with the cruise set at 60 mph when I came over the top of a hill and I started to decend down the hill if felt like my truck had down shifted and the back tires locked up and screeched a little bit then a big bang happened and had no more drive gear as I hit the gas it just reved the motor up and didn’t move. Upon further inspection I pulled the rear differential cover off and my spider gears and the shaft holding the gears in place was snapped in 2 different places, chips in the gears. My transfer case chain was snapped in half and my transmission had hard shift from first to second gear and a loud buzzing noise. . I took the truck to my mechanic and hooked a scanner up to it and took it for a test run. As it was driving a sensor was telling the truck to shift into park as it was shifting from first to second or second to third causing a hard shift and buzzing noise and eventually losing all connectivity to the transmission and internals as well. I have sense replaced the whole rear axel, transfer case myself with used parts and is currently in the shop swapping transmissions as I needed my vehicle to continue working. Safety of myself and or others was definitely at risk when my rear tires locked up the rear end could have slid out cause me to wreck and possibly wreck into someone else. There was also no warning lights or anything on my dash before this incident occurred.