This weekend my cousin and I will be doing a bunch of things to his '11 Chevy 1500 5.3, it has around 250k and needs ball joints, motor mounts and a bunch of other things. He wants to change the transmission fluid and filter, I figured the best way would be to measure exactly how much we drain out and put that amount back in. My only concern is removing the old seal and installing the new one that the filter goes into. do they make a special seal puller to remove/install it? I dont want to damage the bore it sits in.