Is there an online resource where i can get an exploded view of my tranny's internals? I have a 2000 F-150 2wd with the 4R70W tranny and found a part in the bottom of the pan i would like to know where it came from.

My tranny wasn't shiffting into third so i dropped the pan and found this plastic cylindrical cone piece with and O ring around it sitting at the bottom of the pan. I must have spent an hour trying to find where it came from then dicided to put it back together without the piece and take it to the shop tomorrow. Well it works fine now, the only thing i can think of is that this piece was stuck in the intake and keeping enough fluid from being sucked into the system? But what does this plastic part do????