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    1976 Holden HX is missing gear changes

    Holden Holden Advice

    Lately my 1976 Holden HX's M20 gearbox is missing gear changes, but only when the engine is running. When the engine is off there are no problems and it goes into all gears. But when running first and second gears are sometimes harder to select and third can miss. This behaviour only started in the last week. The oil is okay, and I have adjusted the clutch cable. Do you have any ideas what could be happening?

    Answered by CarsGuide
    1 May 2024
    David Morley

    The old M20 four-speed transmission wasn’t exactly a sophisticated piece of equipment, but it was a pretty tough thing. In any case, this sounds more like a clutch problem. Wear or damage in the clutch can cause all sorts of difficult shifting, and the big clue here is that it will do so only when the engine is running, not when it’s switched off.

    You may find it’s a case of poorly adjusted shift linkages or a damaged shifter, but all the signs point to a broken clutch.

    Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.
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