It is in the oil pump on the 4.0 SOHC. You will need to drop the pan and cradle to get to it. Not a fun job at all on this engine when in the car. What brand/model oil filter are you using?
Ahahahaha yeah. I was waiting to see how long it would take before the OP said anything. :kooky:Lol did you really just copy and paste that from Nice Pony off the Mustang Forums?