Evinrude/Johnson outboard lower unit type O 1979-2006
Type O outboard lower unit large gearcase assembly years 1979 to 2006
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V4 gear ratio 2.25:1 teeth 12:27 without speedo OEM 5004639
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V6 gear ratio 1.83:1 teeth 12:22 without speedo OEM 5005401
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V6 gear ratio 1.83:1 teeth 12:22 with speedo OEM 5004635
Shafts are available that clip into lower units for 20 and 25 inch transoms if required.
If reusing the old shaft you will have to disassemble your old unit and remove the pin that's holds the shaft in place.
Please see upper drive shaft page for new shafts.
Large Gearcase "0" Type V4 and V6 years 1979 to 2006
Physical Characteristics are:
19-3/16 inch tall.
Cavitation plate to propeller shaft 8-1/4 inch.
Hub area 4-5/8 inch.
Straight at the trailing end of the gear housing and the fin.
Pointed at the trailing end of the cavitation plate.
Two slots above the cavitation plate.
External water intake screens.