all i know is the engine is pre 85, sorry i dont know the exact year. i looked all over that out drive and i cant see where the gear ratio is located, is that 17 black max a 4 blade prop?. im pretty sure its not waterlogged i had it weighed at the local grain mill, came out to 2500 lbs with gear in it. local marina has a 17p used,,, I'm going to try that this sunday...i need to stress that the engine is running perfectly, it does not need a compression test. i have a video on you tube of our test run 2 nights ago, shows the boat taking off at full throttle, check it out! just type in "eric and denny on pleasant hill lake 2" should pop right up , thanks again!!