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It seems under heavy throttle I developed a vibration that feels like the harmonic balancer is out. Is there any way to check it?

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nobody's had a harmonic balancer go out?

KKB

I had a vibration in mine at highway speeds you could notice it and the faster you went or the more throttle you gave it the worse it got. It was a u-joint that the dealer replaced under warranty.

John DiMartino

Your flex plate could be on its way out the door.Unless you've put a billet one in,you might want to look into it furthur. Also check the tc bolts,make sure they are tight.The harmonic balancer ,while could be the problem is much less likely.Does this vibration come and go with road spead/RPM/load or a combination.Does the TC being locked or unlocked effect it at all.

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I've checked all the u-joints and they seem to be OK. The flexplate is from suncoast, but I will check the bolts this weekend. The vibration is only there under heavy throttle and does change with t/c lock up. Thanks for the tips.

John DiMartino

Vibrations from a load are more likely the powertrain,not the balancer.At the RPM is vibrates at under load,find out if it vibrates in N at that same rpm.Def check those TC bolts,when they are loose they usually give you a slight rattle at idle as a warning that turns into a ticking noise,that stops only when the tc locks.