I'm not an expert, but you might try looking at the obvious problems first like the torque converter bolts being loose. Tighten to spec with Loc-Tite.
If you have a definite knock, that is bad news. IMHO I would track it down or make the shop who did the work help out. At the least, I would inform the shop about the problem and guage the response. Good luck, Matt
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"I work in high speed aluminum tubing."
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