97 chevy viberation

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  #1  
Old 01-10-06, 03:40 PM
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97 chevy viberation

97 chevy silverado w/350 automatic
the truck runs great but when it tachs up to 4000 rpms it has a light viberation, it does it at all speeds. could it be the harmonic balancer?
 
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  #2  
Old 01-11-06, 04:55 AM
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try to isolate the condition. vibrate while not moviing ? if you're not moving it's only the engine/trans area. could be balancer, flexplate,converter. if only when moving check driveshaft, front rotors, rear axles, tires and rims.
 
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Old 01-12-06, 06:44 PM
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it does it moving or not starts at 4k rpm at any speed so that would rule out driveshaft, wheels, rotors, it runs extremely smooth under 4k rpm, i was just seeing if anyone had experienced this before i started changing parts
 
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Old 01-13-06, 04:52 AM
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balancers do go bad but not often, the rubber ring allows the outer diameter to shift. the flex plate is also balanced with a small weight welded to the face that could for some strange reason have come off. my guess is the balancer. when you install a new balancer do not hammer it on. period. i know someone will tell you that's ok but it's not. beg, borrow or steal a balancer installer. torque converter ? never had one get out of balance but maybe a trans specialist could chime in here. good luck
 
  #5  
Old 01-13-06, 07:51 PM
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Originally Posted by j400
97 chevy silverado w/350 automatic
the truck runs great but when it tachs up to 4000 rpms it has a light viberation, it does it at all speeds. could it be the harmonic balancer?
yah, try checking out your harmonic balancer, since it is crucial to the performance of the vehicle and for the longevity of the engine. don't forget that it prevents the crankshaft failure and drives away the vibration energy..make sure that it is mounted well. if vibration still do exist, try checking some perforrmance parts - auto parts that causes your vehicle to vibrates during your driving..
 
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