Removed from boat with a rotting interior with a Mercruiser 3.7 470 engine. Engine serial number is 5873745. Transom serial number that I could read was 5855353. Splines appear to be in good condition. Freshwater use. This unit will definitely need to be resealed, as water came out when I drained the oil so it is not usable in its current condition. No other known issues. Sold as is.