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3rd gear help

Discussion in 'The Hokey Ass Message Board' started by servi53, Aug 16, 2012.

  1. servi53
    Joined: Jun 28, 2006
    Posts: 338


    my 56 chevy 3600 has a 235 six cylinder and 3 on the tree, runs great but pops out of 3rd gear at any given time. If I hold it in gear it runs fine, but if I don't I get the occasional pop into neutral. Any ideas what I can do to avoid this, any help will be appreciated thanks for your time. George
  2. Hnstray
    Joined: Aug 23, 2009
    Posts: 12,238

    from Quincy, IL

    Pull the transmission and rebuild it. The problem you are having is classic syncronizer wear.

  3. aaggie
    Joined: Nov 21, 2009
    Posts: 2,531


    Probably time to rebuild the trans. Worn synchronizer, bearings worn and gear endplay can all cause the problem. It is an easy trans to fix and the parts are not real expensive. Take the side cover off and see how much wear is on the shift fork for third gear.
  4. The problem with a 3-on-the-tree that its hard to bungee cord the shifter to something to keep it in gear, works great on old 4-speed tow trucks.

    I agree, gotta take it apart to see what's what. They're pretty easy to go through unless one of the hard parts has gone kablooey.


  5. F&J
    Joined: Apr 5, 2007
    Posts: 13,222


    The longer it has been jumping out of gear, the better chance that the small teeth on the syncro hub, and the inside of the input gear, are worn at an angle. These side faces of the teeth, need to be 90 degrees to the shaft, not angled.

    If you do pull it apart, look at those small teeth faces.
  6. 40FordGuy
    Joined: Mar 24, 2008
    Posts: 2,907


    Ditto, the synchro.....They did make a "heavy duty" replacement, Supposedly for taxi and police vehicles. I always had an extra one handy....My 57 went thru quite a few of them. I think you'll find the 2-3 shift fork will be well worn as well.


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