A trans flush shouldnt bring about any more problems then before, unless there was something already going wrong. I flush mine everytime I toast the fluid or if it starts getting that smell to it. I drop the pan, change the filter, fill it back up then take the return line off let it run into a bucket will Im filling it through the fill tube with the motor running.
2002 ECSB 2WD 5.3
1995 Formula Firebird 383 LT1
1984 Camaro 408 SBC
Most sports require one ball, motocross requires two.
Racing isn't a matter of life and death, it's much more important than that.