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Transmission or clutch noise?

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  • Transmission or clutch noise?

    Slowly but surely I am sorting through a ’70. The frame is in great shape and there is next to no rust. Mechanically, it has the wear and tear of a 48 year old. Next on the list is the transmission/clutch. The transmission is noisy in 1st, 2nd and to a lesser extent 3rd gear. There is not much noise in 4th. When underway in 2nd, 3rd or 4th gear there is a whirring grinding kind of sound. If I place the palm of my hand on top of the gear lever, with slight downward pressure, the noise abates. While stationary, in neutral, with the clutch disengaged (pedal depressed), no noise. When the clutch is engaged (pedal released), noise. It sounds like what you would think a worn-out bearing would sound like. After reading other posts on this site, it might be any one or more of the following: TOB, counter-shaft wear, input shaft bearing or u-joint/differential issues.
    First, I’m going to change the fluid. Can anyone recommend a brand and type? At the same time I will look for metal shavings at the bottom of the box. I doubt this will remedy the problem and that I will need to have the gearbox rebuilt. Is there any other work which should be done when the transmission is rebuilt? Can anyone recommend a transmission shop in the St. Louis, MO region? If not, who is the best at rebuilding?

    Thank you for your time reading this and I appreciate any advice! Jim
    JHowe

  • #2
    Doesn't sound like the TOB - wouldn't you expect noise with the clutch pedal depressed (ie, bearing engaged) rather then the other way around? Also wouldn't get noise from the U/Js or the diff if the car's stationary - nothing's moving back there. My money's on something wearing in the mysterious black box (to me, at least) that is the transmission
    Dave C
    '72 Sapphire #CC82360UO
    Chapel Hill NC

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    • 70Damson
      70Damson commented
      Editing a comment
      Thanks for the information

  • #3
    It is a worn out countershaft and main bearings. The tranny needs a good rebuild.

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    • #4
      Too get a little more descriptive, the worn out lay gears will be noisy as hell in first gear to almost no noise in fourth. New fluid isn't going to help. Sorry

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      • 70Damson
        70Damson commented
        Editing a comment
        I really appreciate your comments.

    • #5
      I had same symptoms in my 70 box.

      I didn't drive it much, and good thing, when John at Quantum opened it up it wasn't far from hand grenading. Then I could have been looking at a new case too!

      Have it attended to sooner rather than later.

      My box in my 2002 is also very noisy in 1st.
      That's gonna come out soon too.

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      • 70Damson
        70Damson commented
        Editing a comment
        Thanks for the comment!

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