don, serial # OT429946 lower unit busted from freeze. had water in it, bad seal i suppose. i had no way of knowing. it had been running fine. any way i doubt ins. will cover. so i may have to try to replace out of pocket... i think it is 1:75 with 20" shaft. but not sure. i don't know if it is a 8 or 13 spline. just need you to give me an ideal of what i need to be looking for and approx. cost... as usual Thanks in advance...