Kat's Mike L trans is at about 80,000 miles with hundreds of 1/4 mile passes, and several sledpulls, towing, and a lot of goofing off on the street.
Blue has about the same on it's Mike L trans.
Casper never had a trans failure, even at 936rwhp, but it was used for a lot of testing, so it doesn't have the original Mike L in it.
ATS? There was a Casper One. It got an ATS system in it.
First control box (???) was DOA. Shipped from ATS dead. Second worked. Clutches delaminated due to lack of proper gluing, only 60% of the surface was in contact with the steels.
Oh, and the ATS converter did not make it 200 miles of street driving with no abuse at all. It lost it's clutches IIRC and had to be towed back to Mike's.
That was back in 2005, hopefully they hired a quality control tech to stop shipping dog poop out the door.
Sadly, we assumed it was a quirk of the 2WD Allison, and not just junk trans parts, so we sold the truck with less than 4000 miles on it. Only later during the trans autopsy did we find out why it wouldn't shift right.