1991 Ford Bronco Need Help!

My bronco has been hardshifting usually between 1st and 2nd gears, sometimes it doesnt do it between 2nd and 3rd, but sometimes it does. This has been going on for about 4 months now, and just recently it has began to make a high pitched winding noise on and off, and when I let off the of gas it feels as if it is downshifting. I need some serious help to find out what is causing this because I really dont have the money to hit and miss.