Note: Prior to 1995, Ford E4OD pump castings were designated as E9 or F1 and had 11 lobes on outer gear.
Those castings suffered from low pump output and were superceded in 1995 with F5 and in 1998 with F8 castings, containing 10 lobes on outer gear. An E4OD E9 or F1 casting
should be replaced with an F5 or F8 casting. Sonnax pump gear set 36438A-03 is designed for use in F5 and F8 castings only: