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Thread: gearbox locked up...

  1. #1
    Join Date
    Jun 2008
    Location
    Southern California
    Posts
    67

    Default gearbox locked up...

    '70 IIA with o/d: Driving along in 2nd and 3rd mainly, ugly clunky noise, suddenly tough to shift...one block later can't shift in or out of forward gears, for the most part. When I was in gear, it would go sluggishly and jerky. Stopped in middle of road, people loving me.

    Engine off. Very difficult to pry out of gear, can for awhile shift to reverse, but then not even that. In neutral, clutch or no clutch, either way cannot get into gear. Put o/d in neutral, put transfer case in neutral, only then could I push it to the side of the road, where it sits now.

    Clutch is full of fluid, so no failure of lines, etc. Truck is far away from my house in residential neighborhood so not ideal to work on.

    Any ideas on what I'm looking at, next steps, and how to go about it? My instinct is to tow to my house and tear it apart, and likely will find some serious ugliness in the gearbox, but I'd love to hear reasonable speculation and ideas before I do that.

    Thanks in advance, any feedback and input appreciated.

  2. #2

    Default

    Well, I think youve narrowed it down to the transmission!
    Siezed mainshaft bearing(s), grenaded syncro assembly, I guess it doesnt matter at this point- its gotta come apart so you can remove the mangled parts. Get a friend with a tow strap, better yet a trailer or roll back and go get it before something worse happens to it!

  3. #3

    Default

    As usual keep us posted on what you find.......I really like the "Stopped in middle of the road,people loving me" part. Start every ride with this in the back of your mind. My last one was a distributor failure and was dead nuts in the middle of an intersection as i had just moved from stop light with no forward speed.Got to love these things.

  4. #4

    Default

    Quote Originally Posted by 01birddog View Post
    As usual keep us posted on what you find.......I really like the "Stopped in middle of the road,people loving me" part. Start every ride with this in the back of your mind. My last one was a distributor failure and was dead nuts in the middle of an intersection as i had just moved from stop light with no forward speed.Got to love these things.
    My last one was a snapped rear axle. Happily putting the transfer case into low range got me going with front wheel drive and through the intersection quickly enough to keep the love level reasonable.

  5. #5
    Join Date
    Sep 2010
    Location
    killingworth CT
    Posts
    683

    Default

    You know the drill, drain box, transfer box, look through fluid for shiny metal, pull gearbox, breakdown, I like the grenaded synchro, or locked up bearings, look for wear and work splines on main and layshafts, you will find it. Cheers.

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