Strange Shift 6l80

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SethSwitch

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Hello,
I have a 2010 tahoe 5.3 with the 6 speed. My tranny went out when my torque converter failed. I had the internals replaced at Mr. Transmission and a hd torque converter put in. After spending over 4k to get it fixed it doesn't seem right. I keep taking it back to the mechanic and they say they can't find anything wrong. This is how it downshifts when going up a hill. You can see the revs go up down and back up. Is this normal and if not what would y'all recommend I do?
Seth

www.youtube.com/watch?v=7mSRtmoQvV0
 

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