i have a 1988 steigercraft with a volvo penta IO, the engine says aq 211a but how do io determine what outdrive i have? i hear a whirling noise like a bad bearing (metal against metal) that gets louder when turning, i can also hear it at idle at the dock, boat is coming out of water tomorrow[monday] but i would like to know what model outdrive i have, i believe its the original as the motor is also, where there many different models in 1988? i have a seloc manuel for sterndrives from 1968 to 1991, does it help that i have a plastic looking strip with gear teeth on top of outdrive that has to do with tilting? the book shows a pic of it and mentions its a 290 outdrive, is this correct??? help!!!!