Originally posted by bradster313
I think my trans does this to.. I have a 4g64 2.4l and im not sure what trans it is yet besides a 4 speed automatic front wheel drive.(F4A23 ?) When i first start it up in the mornings it takes a lil bit more rpms then normal for it to move in reverse outta my parking spot then when it goes to shift into second it does what your describing, a slight slip catch slip then kicks back to normal. But after i get down the road its fine and will not do it all again all day unless it sits for hours. I noticed when im in park with it idling i think i can hear a fluid movement sound, kinda like a slurping sound coming from the trans area. Im bent on the idea its the pump. I thought maybe a seal but it only does it before the fluids had a chance to be circulated through the trans, then after that its fine. It has done this before and after a trans filter and fluid change. Problem has not got worse. Car shows 178k miles. I noticed also going down hill the down shift is a lil drastic, almost like being thrown into neutral. Would love to know why it does this.

My 1998 rs has the same transmission code on firewall and I'm running the 420a. this is :scratch odd? but my atx filter is cross reference for the a604.

Try autozone/advanceauto website to compare atx filter they all could be the same model.