Yamaha Lower Unit Assembly - F250 - 6P2-45300-41-8D - See Description for Applicable ModelsYamaha Lower Unit Assembly Gearcase Component 6P2 45300 41 8D Overview On an F250, the lower unit takes all that power and turns it into forward motion, so when its off, you feel it right away. Ive worked on setups where everything up top checked out, but the gearcase was the weak link causing noise or poor performance. Swapping in a complete assembly like this brings everything back to smooth, predictable operation. Its the kind of fix that makes the