Henry, what you're describing doesn't sound like "ping". That sounds like marbles rattling in a can. I think you are saying you hear, and possibly feel a "clunk" under fairly aggressive acceleration or perhaps between deceleration and quick acceleration?
If so, I get that too at times, and I don't worry about it. I think it's related to shift strategies in the tunes that cause the clutch to lock up faster (less slippage, firmer shifts).
If this sounds like what you have, then Bill can tell both of us if there's anything to be worried about.
- Jack
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