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Thread: Intermittent vibration at 3000 RPM

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    Jedi Trainee doughairfield's Avatar
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    Intermittent vibration at 3000 RPM

    Good Morning,
    I've got a bit of a conundrum. I've got this irregular vibration which appears to be somewhere in the driveline on my 1964 TR4. The vibration only starts when you pass 3000 RPM under power and itís irregular. I think I can feel the vibration most in the gear shift lever but I can kinda feel it through the floorboards of the car, but not in the pedals or steering wheel. Push the clutch in or go back under 3000 RPM and the vibration goes away. Iím thinking itís some bearing somewhere that is bad but I donít know how else to test at this point. I tried sustaining 3400 RPM in 2nd or 3rd gear but Iím having a hard time finding a stretch of road I can do that on. I donít think I feel the vibration in any other gear but 4th but Iím still testing. I did have a bad transmission mount and replaced that a few months ago. I also had a U-Joint on the transmission side of the driveshaft that was pretty rough on one axis which I thought was the problem and I replaced that last week, vibration is still there.

    Since the transmission mount AND the drive shaft seem to be in good working order now. Any ideas on what could be causing that vibration?
    Doug Hairfield
    -------------------------------
    1964 Triumph TR4

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    Yoda Geo Hahn's Avatar
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    Re: Intermittent vibration at 3000 RPM

    I have never had to have the propshaft (driveshaft) balanced on mine -- but that is one thing I'd look into if I couldn't track down a driveline vibration.

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    Jedi Trainee doughairfield's Avatar
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    Re: Intermittent vibration at 3000 RPM

    That's a really good point about the driveshaft. Now that I think about the vibration some more, it's really more like a resonance through out the car which I think is a symptom of a driveshaft out of balance. Shouldn't be too big a deal to get the DS checked out. Thanks for getting me thinking.
    Doug Hairfield
    -------------------------------
    1964 Triumph TR4

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