I want to change impeller on my '95 Mercruiser Alpha 1 Generation 2 lower unit. It has the gear oil resevoir up in the engine compartment. While I have changed impellers on my old Evinrude many times, this remote resevoir has me puzzled. Is there a connection to this resevoir that I should be aware of or does the gear case drop off like normal after draining it? I checked out Mercstuff but it wasn't mentioned. Any thoughts or advice will be welcomed