Here we have a lower unit for 1980's era 35-40 hp 2 cylinder/2 stroke Mercury outboards and the 45-50 hp "classic 50"models, applications below. This lower unit is in good working condition, it was removed from a running outboard that was only used in freshwater. This lower unit turns over smoothly and shifts correctly. The gear lube was clean when we checked it, no water and no metal. The water pump impeller does need to be replaced! 

This is a long shaft lower unit for 20" transoms, the driveshaft has 11 splines and measures 21 9/16" from the top of the water pump to the top of the load spring. The prop shaft has 13 splines. 

NOTE: There is a 20% restocking fee on all returned lower units. If you do not know if this will fit your motor, message us with your model information and we will verify fitment. By purchasing the item, you're agreeing to these terms. 

This part was removed from a 1985 Mercury 35 hp outboard with the serial number: OA998240

This product fits the following:

mariner 45hp — 1988, 1989mercury 35hp 209608 up — 35hpmercury 35hp 6445653 thru 0b110788 — 35hpmercury 35hp 9384476 up — 35hpmercury 40hp 5556230 up — 40hpmercury 40hp 7144763 up — 40hpmercury 40hp 8064750 up — 40hpmercury 40hp 9251456 up — 40hpmercury 45hp 5531630 thru 0b110788 — 45hpmercury 45hp 7143688 thru 0a719280 — 45hpmercury 45hp 8063985 up — 45hpmercury 45hp 9248006 thru 9466691 — 45hpmercury 50hp 5531630 up — 50hpmercury 50hp 7143688 up — 50hpmercury 50hp 8063985 up — 50hpmercury 50hp 9248006 up — 50hp