So I took my truck out to run some errands, and noticed a few minutes into my trip that I couldn't shift into reverse or 5th gear. It doesn't grind or anything, I tried pulling the shifter really hard, but nothing. I've tried to research what it could be, but didn't come up with anything.

It was working fine when I parked it, in fact, I had reversed it into my garage the last time I took the truck out, might have even left it in reverse while it was sitting. The shifter bushings were replaced a few years ago.

The fact that it's both 5th and reverse doesn't make me think it's a lockout, maybe some sort of damaged fork or something?