Thread: vibration

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Alright,
Re: my before-mentioned vibration....it's not the driveshaft. I also took care of the header issue (rubbing on the steering box), and replaced the transmission mount.....and it still vibrates. The wheels and tires (15X7 rallyes w/ firestone wide ovals) have all been balanced. My next step is to balance the drums. I'm at a loss. Help! Also, re: the four-wheel drum brakes on my car.....yeah, they're not the most ideal way to stop, but, I replaced the master cylinder, all of the lines, and had a shop correctly adjust the brakes and I think they work great. Thanks for all of your help!!!

was the motor recently rebuilt? If it is an externally balanced motor, the rotating assembly could be out of balance. If internally balanced, you may have lost a weight in your harmonic balancer. It's hard to tell because they put the weights on the backside so you can't tell without removing it. That would cause vibration at first and then lead to a heavy knock (your bearings going to pot).

The only other things I could think of would be if the motor and tranny are sitting in there crooked, or if you have something wrong in your rearend. Perhaps some mauled teeth, or bad bearings.

Do you feel the problem coming from the front or the rear of the car?

I think the brake drum thing is going to be all for naught. It may cause some minor vibration, but not what you are explaining.

Are you experiencing any other problems? Crappy shifts, etc? Perhaps the torque converter wasn't properly engaged when it was installed.

There are a lot of things that can cause bad vibration, but our suggestions are based on the premiss that everything has been installed correctly..... and that just may not be the case. Unless someone was standing over your shoulder the entire time, this guessing game could go on forever.


If you check the flex plate... more than likely it isn't the weights, but it could be a cracked flexplate. Cracked flexplates tend to vibrate at certain speeds rather than others. But I have only encountered cracked flexplates twice in my experience. It's usually a product of over tightening with an impact wrench, or poor starter engagement.

It is overwelming, but you are just going to have to determine what part of the car you feel like it's coming from and focus on items in that area of the car.

Find if somebody from the board is in your area and offer them a 6er to come out and check it out, see if they might have an idea.

Best wishes.

What's the frequency of the vibration, fast or more of a shake? When its bad, at 65 or so, shift the trans to second. Does it change? If yes, it's the engine, if no, it's the driveline or tires.

I would say the vibration is fairly fast. I tried a similar test per the input from somebody else....when the car was vibrating, i shifted into neutral and it kept vibrating. Obviously it stopped as the car slowed. I appreciate the input. I'm likely going to focus on wheels and tires next....that's the majority of the feedback I've been getting from others.

Bad shocks can result in wheel/tire vibration also ..............

Good Luck, regards,

Kitz