I have a project 1987 Seaswirl with a 4.3l V6 and alpha one gen 1 outdrive. Motor is running fine and outdrive shifts fine. However, when it's in forward gear and you rotate the prop it is making a clicking noise like it is still connected to the shift shaft in the upper housing. It just gets worse with motor running and in forward gear. After shifting is the shift shaft suppposed to let loose? All input is welcomed before I start pulling things apart.