i have a johnson 5o horse i think 72 mod ?hydro electric drive model number 50es72c it seems to be locked in gear the cable works the throttle freely but as i try to get it out of gear nothing happens i cannot turn the prop freely it is in gear foward or reverse i dont know? when i force the prop to turn it is under compresson load, it seems somthing has come a drift from between the head a the gear box. Does anyone have an idea of what this could be and how i can fix it ?