I Think I Found the Source of the Vibration

Discussion in 'Chassis restoration' started by Clarkie, May 21, 2018.

  1. Clarkie

    Clarkie Well-Known Member

    In my '72, I have been chasing a drive line vibration at cruising speed (around 2700 rpm). I grabbed the transmission crossmember and found that I could twist it. The crossmember rubber insulators look like they're shot (that's where the movement was). I have new ones on order from Inline Tube along with the hold-down brackets. I will get a new transmission mount just to be sure. With any luck, this will solve the problem. We'll see. My fingers are crossed.
     
  2. buick64203

    buick64203 Right wing conservative Staff Member

    Hopefully the ends of the crossmember aren't rotted
     
  3. Ken Mild

    Ken Mild King of 18 Year Resto's

    Interesting. I should check this on my car. I welded new ends onto my cross member when I reinstalled it years ago but maybe something got messed up over time. I have an annoying vibration at about 2K rpm then again a little higher rpm cruising speed of 65-70 mph. Could be old two piece rubber sleeved drive shaft out of balance or maybe the cross member bolts loosened up or weld broke loose.
     
  4. Clarkie

    Clarkie Well-Known Member

    With any luck, it's not rotted out. It seemed like the whole thing was twisting and the rubber insulators were moving too. We'll see. I'll let you know when I find out.
     
  5. gstewart

    gstewart Well-Known Member

    U can probably buy the transmission mount & bushings from a local tranny shop.
     
  6. Clarkie

    Clarkie Well-Known Member

    The vibration is gone. It's almost strange driving without it...almost.
     
    Harlockssx and BYoung like this.

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