We were out trying to run some jug lines last night and the old reliable 77 Evinrude 35hp suddenly became stuck in gear. It's normally very smooth shifting with the remote control and was suddenly just plain stuck. We found that with enough brute force we could get it to neutral and reverse, and the engine seems to run just fine in gear - no strange noises or anything. But shifting is almost impossible - we had to disengage the remote control cable and really bear down on it to get it to move. Fortunately, the neutral lock-out switch was disconnected long ago by some previous owner, so we were able to start with it in gear. But it sure made for a fun evening of trying to run the jugs. Before we tear into the lower unit, can you give me any idea what might be wrong and how extensive the repair might be? We have the service manual but maybe this is one best left for the professionals? Thanks!