2000 S-10 Shifting problems.

When I am driving my transmission has a hard time shifting but does when I let my foot off the accelerator pedal. When I shift into reverse it does nothing but sit there like it does in neutral. I tried changing the fluid. I hear a winding noise comming from the transmission when idoling and in any gear I put it in. I hear it the loudest when I have it in reverse. It is an automatic transmission. I plan on getting it rebuilt but if there is anything I can do cheeper that would help for now, I would like to know.