Please help me get reverse!!

[Jonnio]

I would appreciate any help that someone can give me on this problem so I don't needlessly pull the tranny or something.

1989 Mustang, 5.0, T-5 with hurst shifter. The car was driving just fine and shifting fine when I left home last weekend, then about 4 hours into my trip I downshifted to pass someone, passed them, and when I shifted back into 5th I noticed a slight grind, then the car went into gear and no more problems so I didn't think much of it. Then when I made it back to school, I went to put the car in reverse to go into a parking spot and there was no reverse. It doesn't grind or anything, just doesn't go into gear. I guess the best way to describe it would be like trying to put the car into gear without pushing in the clutch (without that whining noise)

Thanks a ton for any ideas
-Jonathon