I have a '81 Evinrude 50 that I tossed forward gear on,I found a used lower unit complete for a $100(!!!!!)had some water in it ,bearings seized all other parts okay,Took it apart all parts are identical down to part # except for the forward gear-my broken one has a thrust bearing and the salvage part has a caged roller bearing.<br />Can I put the salvaged prop shaft in my old lower unit?<br />Thanx 5150