was moving along sunday about 15mph when the out drive loses power, RPM's race up but prop stops spinning..smoke out the back of the drive . lift the engine cover and no smoke there.. turned off motor. look around for kelp or something that I might have caught..all clear. restart engine seems okay...put her in gear and hear bad metal grinding sound out of drive. turn off motor right away. now I had just got her back from the shop and when I tested it that day(two weeks ago) I noticed a vibration from the back of the boat..thought it was just me not being used to it since they repaired a motor mount and that it was normal. motor had to be lifted in the boat to do the last repair...anyone have any idea if they have to disconnect the outdrive to lift the motor?? 25ft chris craft, mecruiser 5.0 with alpha 1 drive . is this the gimbal bearing maybe? just had that replaced last september...and did not have vibration before it went in for repair. rookie needing more help.