In 2003, Ford revised the 4R70W transmission to include: A stronger ring gear that has 24 lugs (as opposed to 6) for the output shaft sensor (OSS) to read from, a revised torque converter, a revised front pump assembly, and a vehicle speed sensor (VSS) that complements the OSS to improve shift quality and efficiency.
In 2003, Ford enhanced the 4R70W transmission by strengthening its ring gear with 24 lugs to read from the output shaft sensor (OSS), replacing the torque converter, modifying the front pump assembly, and adding a vehicle speed sensor (VSS) that works in tandem with the OSS for better shifting.