transmission problems with my 300D 1995

[zxdent]

I rebuilt transmission more than 1 year ago, and recently noticed that it takes a few seconds after I press gas pedal to start moving. To the reverse is even worse. Yesterday I went from my home and just when got on the road trans. stopped working. Tried movind into all gears but nothing.
A few times trans. did not want to switch into a 3rd gear when climate switch was in ON. (or maybe in OFF, I am not sure.) So, Is it possible that the problem can be with the vacuum. Please if anybody has some experience with this, let me know.
Thank you, zxdent