rebuild transmission

Discussion in 'General Motoring' started by jfindlay, Jan 6, 2006.

  1. jfindlay

    jfindlay Guest

    I have a 1988 GL series wagon, 4WD with a manual transmission which is
    quite worn down. I want to take a few days and rebuild the
    transmission myself.

    What unforseen difficulties am I ignorant of? Can I buy a bearing
    replacement kit at the local auto parts store? Will I be able to put
    all the parts back together easily? Can I pull it off the block and
    power train without special tools? Can I hold it up with one hand
    while bolting it on with the other? Am I crazy to want to do this?


    Justin
     
    jfindlay, Jan 6, 2006
    #1
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  2. jfindlay

    mulder Guest

    I don't know the particulars of that transmission, but in general to
    disassemble and rebuild gearboxes successfully you need special tools
    to get things apart and back together, as well as to set the critical
    clearances. If you don't have these, and have never done this type of
    job before, I'd highly suggest doing a lot of research before
    proceeding. Depending on your budget, your best bet here may be to
    find a good used trans from a junkyard or to have a qualified shop
    rebuild yours.
     
    mulder, Jan 6, 2006
    #2
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  3. jfindlay

    johninKY Guest

    May be a good idea to experiment on a junkyard transmission first. Just a
    feeling but I think without any experience or manual you are headed for
    trouble. Sometimes what seems to be a worn out transmission is in fact
    just the shifter in need of new bushings. This model also has a history
    of loosing a spring in the shifter mechanism which causes the shifter to
    flop around.
     
    johninKY, Jan 6, 2006
    #3
  4. Ask in the proper forum at www.usmb.net . Likely someone there has
    rebuilt the same tranny and may have suggestions.

    Carl
     
    Carl 1 Lucky Texan, Jan 6, 2006
    #4
  5. jfindlay

    S Guest

    Hi Justin!

    It's not a trivial undertaking. The easiest solution, as Mulder
    suggests, would be to find a serviceable replacement at a salvage
    yard.
    If you do decide to attempt a DIY rebuild, you will want to find a
    large clean table indoors somewhere to work on. Also find an exploded
    view of the tranny; make several copies, and keep notes on 'em as you
    disassemble.
    Be absolutely sure you have removed all of the case bolts before
    attempting to separate the cases; there is at least one hidden bolt
    IIRC. Everything must be spotless before you begin reassembly, and
    this alone can be a challenge unless you have access to a decent parts
    cleaner. Probably the only "special" tool you will need will be a dial
    indicator and magnetic base for it; anything beyond that is beyond the
    scope of a DIY project, and best farmed out to a transmission shop;
    this would include reworking the input/output shafts to replace the
    synchros, and probably at least a couple of the bearings will require
    a shop press and appropriate fixtures as well.

    Unless you are pretty stout, you will want a transmission jack for
    removal/re-installation. If you're working w/o benefit of a car hoist,
    it's probably easier to pull the engine and transmission as a unit,
    and separate them on the floor.

    Do the clutch, pilot and throw out bearings, and rear main seal while
    everything's apart, and it might even be worthwhile to replace any
    questionable axle boots as well.

    ByeBye! S.
    Steve Jernigan KG0MB
    Laboratory Manager
    Microelectronics Research
    University of Colorado
    (719) 262-3101
     
    S, Jan 10, 2006
    #5
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