https://youtu.be/fs_HAqdespA
Any ideas what it could be? It happens in all gears, I thought it was 4th at first, but then I tried it in all gears and the sound happens. Oil changes <4m miles, last one <1k miles ago. Tranny flush 1mo ago, it's been happening for 2mo. The tranny oil cooler lines were leaking, but was fixed. The car is boosted so maybe the flex plate?