[TAMM]

I have a 1990 Hyundai Sonata which has developed transmission problems, it will not shift smoothly between 1st,2nd and Drive (it bangs into gear) Also if it does make it into drive, it will drop into second with a bang after a very short period of time. When the car is cold it shifts smoothly thru the gears as normal, but as soon as the car warms up the shifting problems begin. Any suggestions? I have replaced the filter and the fluids with no change in operation.