Re: Johnson Evinrude 9.9/15 lower unit interchange

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April 13, 2018 at 11:54 am #73911
Don
Participant

    US Member

    Jim
    The difference is usually only the upper driveshaft splines…74-84 models use the grooved splines/oring, 85-92 models use the driveshaft with no oring for the splines…
    The 93 and newer models are a bit different than the earlier models….
    Casting numbers on the gearcases will be no help in trying to identify these things, you need to be able to look at the driveshaft identify. Keep in mind, the driveshafts are easily swapped on these units, they just pull out….