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Thread: No Fourth Gear!

  1. #1
    Another day Another 5th ARM5280's Avatar
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    Oct 2005
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    Black
    Murdered 2006 GMC Sierra

    No Fourth Gear!

    I for some reason cannot shift into fourth. Clutch or no clutch it just grinds. I can sometimes get it in if and only if it is while slowing down. All other gears work perfect and I have never had any tranny probs. HELP!!!

  2. #2
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    SILVER
    2004 CTS-V

    Sounds like an internal transmission problem. Need more info!

  3. #3
    Member
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    metro Detroit area
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    Your 3/4 shift fork is wallowed out and preventing a full engagement of the synchro sleeve( what gets the gear). This is a well documented problem and the fix is as well= replace the fork with an iron one. It will require a full teardown of the trans.

  4. #4
    The Bandit Wesman's Avatar
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    SGM
    1998 Trans Am WS6

    Is your 3rd gear fine, i.e. it goes in smoothly all the time and doesn't pop out?? Because a bent or damaged shift fork will usually affect both gears it controls, so if the 3/4 shift fork is damaged, both gears should be having issues. It is possible that is only affects 4th gear, but its less common.

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