727 Torqueflight will not go into reverse

The 727 Torqueflight in the '69 Barracuda we just got done with now will not go into reverse. We finished the car (for the most part - these cars are really never done) back in Sept. '14. I've only put 150 miles on the car since then. I last drove it in December and it ran fine - shifted thru the gears and went into reverse. I went to take it out last weekend and it would not engage reverse. It goes into drive no problem.

Anyone have any thoughts on this issue?

Is it OK to put it in neutral and roll it out of the garage and then drive it normally?