Ok so I was driving my 1983 300D turbo into work this morning. The transmission was flaring a bit on the upshifts. When I pulled into the parking lot at work it downshifted and then felt like it was applying the brakes on its own. It came to a stop and I was able to shift it into park and then back into drive, it went a few feet and did the braking thing again. So I kept doing this till I got a parking spot.

I shutdown the engine. I went back out to take a look at it and now it will not move no matter what I shift into. When I apply the throttle it feels like it slightly wants to move forward and that is even when I am in reverse. Any ideas? Hopefully my transmission didn't just die.