Vibration right off idle

Check your tranny fluid on the stick on a white paper towel to see that it is nice and bright cherry red yet, and not any fine filings in it.

Just wondering if that new converter is fitting in the front pump right.

Worse scenario is you drop the pan to check for any metal or bearing material, and make sure the filter looks clean yet.

Even before dropping the pan you could unbolt the 4 flexplate bolts, then rotate the converter by hand to make sure it is turning freely.

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So here is the question? Was it a good working used transmission to begin with. Or a rebuildable core that you rebuilt.

Did the trans come with it's own converter and you decided to just get a new one?

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Just trying to figure if it was a good working transmission, what changed.
The New Converter ???