Section 07-03B: Transmission, Manual, Model S5-47 ZF
1996 F-Series Vehicles Over 8500 lbs. GVW Workshop Manual
CLEANING AND INSPECTION

Bearing Retainers

Replace bearing covers that are grooved or showing wear from the thrust or adjacent bearings. Check the oil return threads in the bearing covers. If the sealing action of the threads has been destroyed by contact from the input shaft (7017) or output shaft, replace the covers.