I have a 2002 2100 SD and the lower unit has went out in it. I am looking to buy a replacement quickly to get me back on the water this season. I know the boat has a 5.0 V8 with an Alpha 1 Gen 2 outdrive. What I don't know is what the gear ratio is. Unfortunately the boat is stored 200 miles away from where I live and I hate to drive there just to look at the serial number on the outdrive. I have the Hull serial # but that doesn't seem to help.