I believe it is the 91% stall. It is smooooooooooooth. I actually thought that my BullyDog pup was messed with, as it was with the truck during the transmission install. It felt like it was on the extreme setting, but it was still on performance. I set it back to stock, it feels like twice the horse power with the BD Power taransmission transfering the power. Oh, I wish I would have went this route the first time...
The ATS stall was 89%, I believe... If you are looking at a transmission upgrade, give some serious thought to the BD Power set up, totaly AWESOME!!! Just hope it lasts!
Mike