2001 chevy suburban vibration at 2300 rpms?

daddy d

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i have a 2001 chevy suburban and it runs fine but has a vibration at 22 or 2300 rpms .could this be a bad torkconverter or a bad harmonic balancer????
 
where is the vibration coming from? could it be the exhaust? my dad's corvette had a vibration at 3000rpms. he took it to a muffler shop and they heated the pipe and bent it slightly to change the frequency or something
 
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