Driveshaft problems of the 2017 Chevrolet Silverado

The contact owns a 2017 Chevrolet Silverado. The contact stated that while driving at approximately 60 mph, the vehicle made grinding sounds. The contact pulled over on the side of the roadway. Upon inspection, the contact noticed flames coming from the rear differential, and the driveshaft had detached. The contact extinguished the flames with bottled water. The vehicle was towed to the dealer, where it was diagnosed that the rear axle had detached and the driveshaft had struck the transfer case. The contact was informed that the rear end and transfer case needed to be replaced. The vehicle was not repaired and remained at the dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 74,000.

Noticed after purchase that there is vibration like a bad tire 35-42 mph. Vibration felt in seat,console and steering wheel 58-65 mph. Transmission down shifts hard sometimes feels like being bumped from behind,it also hesitates and jerks after letting off the accelerator and accelerating again between 25-45 mph. When accelerating it surges,jerks and stumbles. Sometimes when accelerating the transmission downshifts and hangs in that gear until you let off the accelerator. Under heavy acceleration there is vibration in the power train and the transmission seem noisy. At 25 mph it shutters like the transmission is in to high of a gear under light acceleration. Returned to waldorf Chevrolet where I purchased it and was told they balanced 2 tires and reset the road force,scanned transmission no codes transmission ok after shop foreman road tested for 21 miles no other repairs needed. Picked it up driving home noticed all the problems were still there and after inspection of my wheels noticed that the wheels were balanced still had the old weights still on the wheels with new weights also. Made another appointment this time to have shop foreman (rick) ride with me to show him what it was doing which we did and left my truck again. After 8 days I am told it was ready I was told they did a pico scope test and the driveshaft was being replaced then only tested it was ok. Checked run out on flanges all within specs. Found the right rear tire bad. They put steel wheel from another truck on and road tested with no change. They drove another truck and it rides the same. Even has the shutters on hard acceleration. Said they called gm tac back and they don't see a problem with this. Written documents be sent via mail. Made another appointment.