On the right hand side of the AOD-E/4R70W is a multiplex plug tied to two shift control solenoids (SS1 and SS2), a converter clutch lock-up solenoid, and the EPC solenoid.

Read on about this stock 5R55S auto transmission being replaced by an all new Lentech 4R70W overdrive unit. More details and photos of the swap only in Muscle Mustang & Fast Fords ...