Awesome news, hope it stays trouble free!
As far as redesigning the pump and gears specifically for you, I’m having a difficult time believing GM on that. From the day they actually found your issue, to the day they said it was redesigned and fabricated, appears to be 10 working days. I do believe you’re the first person to have an in service repair done (on a ZL1). I also think the part was already in development, or redesigned before your service visit. I say this because there are lot of A10 complaints from Ford truck owners, most specifically related to whining.With those complaints, some are indicating they think it’s a bad transmission pump.
Without your post, some people ( including me) may have assumed a whine or rattle may be normal. Thanks for the info!