pulled lower unit to replace the impeller recently and it went without a hitch. ran it in the yard after rpair and all was well. parked it in the garage and that was it. heading out on a trip next week so i went out to charge the batteries and noticed gear oil on the ground. i know its gear oil from the smell. drained it to check for water but there was none. so i go back into my memory to go over everything i did and the only thing i can come up with is the shift linkage coming out of the lower unit. this is a force 1996 75 hp elpt. now the shift linkage is threaded into the lower unit. in order to line it up with the hole on the motor i had to back of the threads at least 1 turn. is it possible the linkage needs to be tightened all the way?....will gear oild leak from there if its not?. any help would be appreciated...thanks in advance