Just say no!
If you must, at least pull your driveshafts and save yourself a little headache. I got 2.5 hours from home when this happened. Ruined the day.
Going 65 miles per hour and it randomly popped into gear. THe shockwave not only fragged the case, but it also bent the front output shaft. That's pretty crazy considering that the front output is only about 6" long and and about an 1" thick.