Sorry, Red - I'm not seeing (hearing?) what you are. To me, it sounds pretty normal, once you get past all the exhaust noise. I personally like "quiet" and that noise would drive me right up a wall.
What you were describing made me think it was a "slip" and and an abrupt "lockup". I was not seeing that on the video. What you have COULD be a small needed adjustment in the WOT upshift RPM and the WOT max RPM.
I would not have the upshifts much higher than 5000, maybe 5100 max and then set the max RPM 400 higher. But, keep the 3-4 upshift quite a bit lower, at around 4500. You are getting a HP and a torque dropoff above 5K, so it doesn't make a lot of sense to go much higher than that. Bill has said to keep the 3-4 upshift lower to minimize stress on the transmission.
Above 5400, your Torque Converter starts to balloon, so that's why you really don't want to set the max RPM too high. I would never put it above 5600 for that reason and I sure would not consistently have it revving in that range.
The max RPM needs to be at least 400 above the shift point to allow the shift to take place. There is a moment when everything is "uncoupled" and the engine is freewheeling and accelerating rapidly. If the max is not set high enough, you'll hit the rev limiter before the shift completes.
- Jack
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