First, let me start by saying that I'm not very mechanically inclined.
My son (in the Army, out of state) has a 2014 Silverado 1500 with the 5.3 and 105,000 miles. He had a loud rattle in the rear of the truck and took it to a repair shop. Long story short, one of the lug nuts was off and rattling in the hub cap. Before realizing that, the shop decided to check the transmission/TC to see if that was the issue. They immediately said the fluid was nasty looking and needed to be flushed at best. They prepared him an estimate and low and behold, it was to replace the transmission and TC for about $5,500. He has had no issues with shuddering or slipping. I told him to get the truck away from that place.
Now, after reading, I see that lots of these trucks have a common issue with the TC that leads to issues with the transmission, but he has had no problems....yet. I told him to take it somewhere else and see about just getting the flush since the fluid looked so bad. He called a couple of other places, including a couple of dealerships in his area and got mixed answers. One said a flush and filter change was necessary, one said flush but doesn't recommend changing filter, one said they could do it but he's just putting off a bigger issue...even though he's had no problems. Is it really just a matter of time before he has bigger issues? Will the flush help prevent those issues? Is it time to flush and then get rid of the truck????
Any advice?