i changed my trans fluid 2 days ago and yesterday the stupid rubber gasket blew to pieces, to i went and got a manufactures gasket and more fluid and did it again yesterday, and now it it doesnt seems to be shifting properly. sometimes it works fine and then other times it will take extended periods to shift and sometimes it wont go out of 2nd. any ideas? i used atf4 and its not over or underfilled

 

If you gasket blew, you may have some debris floating in your system. The 2 pressure sensors in the valve body are very susceptible to small particulates. You may need to drop the pan and the valve body and clean the sensors.