I am not able to get the lower unit off to change the impeller. I took off the 4 bolt to split the lower case from the upper. There is only about 1/4" of space between the upper and lower. I did manage to find a allen bolt that holds the upper and lower shift rod together. Even though it was a tight squeeze i managed to disconnect the lower and upper shifter shaft but i still cannot get the lower unit off to change the impeller. Can somebody give me any pointers. Thanks