1997 Jeep Laredo

Transmission problem
1997 Jeep Laredo 6 cyl Two Wheel Drive Automatic 254895 miles

replaced the transmission on my car with a used transmission didnt change the filter though. Car drove well for a good two months then started acting up on me the day before yesterday. It wont switch into the gears when I put it in drive it wont go foward, when I put it in reverse it takes a minnute but it switch and makes a wierd noise. I did a filter kit and it drove perfect for a day, woke up this morning and its messing up again. What could it be?
August 27, 2010.

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