having done some research on the ford newholland parts , I see where there is the pick up tube and screen and two variations of the placement of the trans filter . owner stated that the tractor is currently outside and I have know way of knowing if it has always been stored outside and it is in a cold climate.
so has I understand it,the differential and trans share the same oil and it is used to supply the torque converter and the screen pick up is located at the bottom of the trans case. If it has been stored out side for some time that would make sense that the trans may have taken in rain water. further research as indicated that the 4500 shares many of the same shuttle parts with later built ford units . and the drive discs where also used on many john deere's also and many parts including the pump are available aftermarket.