When accelerating, it started around 35 mph, I would be driving and it would feel like hitting a speed bump, even though there wasn’t a speed bump. Over the past month, it has moved to about the 45 mph, and the rear wheels completely lock up for a second, cause the tires to ‘squeal’ as if slamming on the brakes. It gives anyone in the vehicle a whiplash effect. Any loose items in the truck will go flying. It is a scary situation and I am worried it is going to cause damage to myself or my passengers or cause an accident. The term given to me by the dealer is ‘Momentary Rear Wheel Lock-Up’. They were very familiar with the issue, but since my VIN wasn’t on the recall, they wouldn’t do anything. This has happened numerous times, starting back in early March. The issue has escaladed and gotten worse. The latest date is noted below.