Theis is the closest the poulan parts diagrams is to the transmission,
https://www.jackssmallengines.com/j...ride-mowers/pp19a42-96046007700-2015-08/drive
you may need to find the make and model of the Transmission, probably a tuff torq. usually they're on a sticker on the bottom side of the trans, i believe. One of the other members on here might can find out what trans you have from the Poulan model # you posted.