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I had my transmission replaced about a year ago with a used one. It worked great for about a month, but then it started to stick in the different gears. So I would have to let off the gas so it could catch. But about a week ago I was driving It didnt want to go out of first, all it would do was just rev up. It will fix itself if I go into park and then back into drive, but only for a little while.

So am I going to have to replace the whole transmission again or is there a possible fix?  

can you post year.. model, engine type.. transmission type..  

Its a 1994 Jeep Grand Cherokee, straight 6 engine and is has an automatic transmission.