Get yourself about a 3' piece of heater hose big enough to fit over/inside the pump end of the trans filter. Once you get the old filter out, cut the part that goes into the tranny off at the base where it meets the main filter. Put the heater hose on/in the piece you cut off. Stick the cut off stub back in the tranny & put the other end of the hose into a container of fresh ATF (4-5qts). Start truck & let idle till jug is sucked empty, about a minute. The tranny will pump the new fluid into the conv. and displace the old fluid. The old fluid will drain out of the tranny & into the drain pan. Install new filter and reinstall pan.