Don't know about newer stuff...
One of my friends used them for a rebuild on his transmission for his 2003 Chevy 4 wheel drive and charged a fair price and had a warranty. Another friend used them to rebuild his street/strip c4 in his 65 Galaxie with a 460 in it. I thought i had issues on my 05 Duramax Allison 4x4 and took the truck over them and they checked into it and no issue, no charge. I did change the fluid in the transfer case. I was thinking I had the pump rub issue in the transfer case. My truck has been fine for the past couple of years.