F250 Difference between ZF S542 ZF S547

I have a F250 7.3L diesel 2WD manual transmissionQuestion:  Please tell me what is the difference between ZFS542 and ZFS547.Answer:   The S547 has a higher torque rating than the S542… the S547 has a different design to the syncro teeth. In our opinion both are adequate transmissions for your application.You can find parts for your Ford ZF transmission on our site.