ok had my trans seals and converter replaced last year nothing internal replaced. now after it warms up about 15 20 mins worth of driving it starts to leak fluid out of vent tube. so i thought my filter was plugged so i replaced that and it still does it , does anyone know what this might be ? ......hopefully not the front pump !thanks guys for any help please. it is a 95 s-10 blazer 4wd 4.3 4l 60 e trans

 

Generally only two reasons for it to puke out the vent tube.
overfilled, or over heating.