As a follow up. It's been a couple of months now since the torque converter was replaced. I did not take it to a dealer for the simple reason the dealership quoted twice as much as a transmission specialist. The PO741 code has not returned and the 2017 Sierra 2500 has not had the shudder issue, which I noticed only a couple of times before replacement. I did ask, and was assured by the transmission shop, that the replacement torque converter was an updated one before the work was started.
One way to check your transmission is by pulling the pan and checking the magnet for metal shavings. It's what the dealership was going to do in order to diagnose if it was the converter or trans, but I had already checked and found no shavings on the magnet.
After the replacement I inquired into what shape the old torque converter was in. The tranny shop responded that looked okay, but the only way to know was to cut into it and look at the internal.
On a side note: I just had the output seal of the 4wd transfer case replaced, which was likely disturbed when the shop pulled the drive line for the converter job, which can easily happen with such seals. All it takes is a tiny nick and it will leak. You may want to check for signs of leakage there.
Hope this helps,
RV Johnson --epic fantasy author