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My '92 Silverado 1500 V8 5.7L has a vibration problem. Between 65-75 I receive vibration from the front end. The tires are brand new and balanced, and I have had a 4 wheel alignment done. The idler arms have recently been replaced also. My dad thinks it is the ball joints. Has anybody had this problem before? or does anybody know how to solve it and/or what it is?
 

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I agree, I don't think it is the ball joints either. Ball joints usually make a clunking sound when turning or when you hit a bump. A cautionary note that if a ball joint fails, the front suspension will collapse causing loss of control. Read more about ball joints at: Yahoo

A rare case can be an imbalance in the drum or rotor. Wheels and tires are usually balanced off the vehicle. An out of balance drum or rotor will be missed by this technique. I used to use strobe balancing on my racecars. Mostly because the shop had the equipment and it allowed precise placement of wheel weights.

Speed related vibrations usually indicate an imbalance of some sort. Have someone drive alongside and check to see if there is visible wheel hop on either side.

Is your truck a 4x4?
 

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Did the vibration start when you put the new tires on? If so, one of them could be out of round. You might try swapping tires front to rear and see if the vibration follows the tires.
 

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Shave the tread to make 'em last longer

Did the vibration start when you put the new tires on? If so, one of them could be out of round. You might try swapping tires front to rear and see if the vibration follows the tires.
Ah, yes, I remember when tire shaving was popular. Back in the day when Goodrich T/A sponsored a stock sedan racing series we would shave 2 - 4/32" off the tread depth. If you ran the tires at stock depth the steel belts would be showing by the end of the race. If you shaved the tires they lasted the whole race. Heat build up caused the tires to wear faster and loose grip. It just seemed unnatural to me to 'cut' tread off to make a tire last longer.
 
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