OEM Mercury 75-90hp 4-stroke 25" Lower Unit with stardard 2.07 gear ratio. Removed from a low-hour, running 2003 Mercury (made by Yamaha) 90hp 4-stroke serial #OT329823. Fits approx. 1999-2006 and will also fit Mercury F115 but it may have a different gear ratio.

This lower unit does NOT fit Optimax or 2-stroke outboards.  Gearlube & water pump are new so it is ready to bolt-on and go. 

SHIPPING: I can package and ship via UPS Ground within the Continental US ONLY for $69.