On [XXX] as I was going in reverse the car started to accelerate out of control, I pumped the breaks and it increased speed, I then tried to power down truck and that did not work. My vehicle ended up going in ditch backwards and I hit a mailbox and ditch. Earlier in the week when I went to go from reverse to forward it felt like it was locked and then it would engage. I do not feel this is safe and will not ride the vehicle as I think there is something wrong mechanically with the truck. Police report will be uploaded in 1-2 days. My email address us [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)