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Thread: Lower Unit swap

  1. #1

    Default Lower Unit swap

    Hi Guys,

    I have a 72 Mercury 1150 with a bad lower unit. What years lower units are interchangeable?


    Thanks in advance!
    Last edited by DrakeBrake; 08-18-2018 at 08:15 PM.

  2. #2
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    15,701

    Default Re: Lower Unit swap

    Many years do, with 80/85 hp fours as well as sixes. Try doing a part number search to compare motor parts.

    Jeff

  3. #3
    Join Date
    Jun 2013
    Location
    Duluth Mn
    Posts
    736

    Default Re: Lower Unit swap

    You can look right here at marineengine.com/parts

  4. #4
    Join Date
    Nov 2011
    Location
    tennessee
    Posts
    3,022

    Default Re: Lower Unit swap

    1970-88 inline 6 are direct bolt on and go...if you use a 4 cylinder the gear ratio is different and will have to change prop pitch.
    Pappys Sales and Service
    Owner and Factory Certified Technician
    Former racer KDBA (Kentucky Drag Boat Association)

  5. #5

    Default Re: Lower Unit swap

    Quote Originally Posted by faztbullet View Post
    1970-88 inline 6 are direct bolt on and go...if you use a 4 cylinder the gear ratio is different and will have to change prop pitch.
    Thanks for the input!

    I have another lower unit but wasn't sure, as there is a two piece dog around my shift rod on this one and just a cam looking one attached to the new unit. Everything else looks the same.

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