135-200 hp Mercury V6 Lower unit. This lower unit shifts & turns smoothly.  When we drained the oil we noted it had a string of moisture in the gear oil.  Probably a good idea to do the seals.  Needs a water pump impeller installed prior to being put back into service.  This had doel fins on it, if you want to add them the holes are already there.  This is the earlier model that has the load pin on the drive shaft end and has the studs for the extension housing,  The drive shaft has 8 splines. This is an extra long shaft for 25" transoms. The propeller shaft has 15 splines. Fresh water parts. Good replacement gearcase. See pics. 

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GM225222

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