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Thread: Converting 999 non lock to lock up

  1. #1
    Bulltear forum member Cook
    Join Date
    Dec 2007

    Converting 999 non lock to lock up

    I have a 999 auto in my 86 cj7. I want to put lock up in this. Can i just get a lock up converter to a 999 with lock up and put in my auto , or do i have to change anyting else???? Anybody done this before ??

  2. #2
    Thank you from BT ULTIMUS MAXIMUS STATUS tufcj's Avatar
    Join Date
    Apr 2004
    Watkins, CO
    I don't think so. The hydraulic pressure for the lock-up converter comes in thru the main shaft. It's hollow, and I believe there are special ports inside the valve body. If the swap is even possible, it would also take a full rebuild of the trans.

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  3. #3
    Helpfull BT forum member Swabie
    Join Date
    Oct 2008
    cr ia
    input shaft different valvebody is different have been told that the case is different as well but never looked to verify

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