I apologize if it's a repost but I tried searching for a similar symptom and I found wealth of information about rebuilding 722.358 (just learned the code ) transmissions but not a particular problem which I'm experiencing.

Transmission in my car just gave up, first it was engaging slightly, the car would get into a gear after few seconds (it was talking its time) and move. Now it doesn't move at all regardless of being in D 3 2 or R. if I maintain 2000+ RPM then it would move probably few inches. It all happened within couple of days, I did notice a sharp sound even when the car was stationary in P or D, the sound would go away after a little while. Now I don't hear that sound anymore.

So my questions are: if the transmission is gone, or it can be one of the vacuum lines or a modulator? BTW I have checked the tranny fluid level/color which looks fine.

Few weeks ago I replaced the belt tensioner though, I wonder If I could have disconnected something while I took apart some pullies and fan clutch. TIA