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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
What is the idle speed?
If you raise the idle with throttle applied does the vibration stop at a certain rpm?
At idle does it run rough like there is a misfire?
Did the rebuilder use a vibration analyzer to try and figure out what is out of balance?
While driving is there a power loss?
My suggestion is to use a scan tool to run a cylinder contribution or power balance test and relative compression test. If any cylinders show weaker than others then a manual compression test is needed. If one or more cylinders are low then you may have a bent rod which will cause that cylinder to have lower compression. Other possible causes are a damaged balancer or missing nuts holding the converter to the flexplate.
A vibration analyzer will be able to tell you the diameter and rpm of the part that is spinning out of balance once some math is done based on the hertz reading from the tool.
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Thanks for using Just Answer, Chris
Hello again Chris here,
Thanks for getting back in touch with me. Keep me updated.
I am now, what would you like to talk about?