Rear Tires Suddenly Lock Up Going 65

For what it's worth my mistake in putting the shoes on wrong took over a year to reveal itself. Drove great over 800 miles, untill one day! Bam right front wheel locked. So I am just saying that if the shoes are installed incorrectly you may not notice by a mere quick look at them. The last brake job even if you did not do it can still be the cause! Just thinking inside the box on this. In my opinion you would of had something break "if" the tranny went into reverse, for only a second, you would of heard it! The senario you describe leads me to believe, either rear end gearing malfunction, or more likely the rear brakes. I still bet on brake issue!