ive heard good thing and bad things about ats, mainly lack of customer support/service sometimes. haven heard all that much about them failing and nearly nothing about them with the Allison, but its got to be better than stock. test drive it and see how it feels. i was told mine had an ats when i bought it but the receipt they showed me for the tranny said nothing about ats and the thing doesn't shift worth a damn, also had the wrong pressure sensor in it. i would do a good test drive with it and go from there.
I have had it for about two years and 30k miles no problems. Not pushin a lot of horse but i like the trans a lot. Co pilot really makes a diffrence in shift firmness but i rarely turn it on. My buddy with a 80mm over a stock turbo setup has the stage 1 trans like that truck and dont believe hes had any problems with his eithier
Haha, my truck is a whore now but thats cuase I spoil her. I mean I dont wanna get it and constantly there be something wrong and another problem, etc . . . I had a 6.0 once apon a blue moon, no more problem diesels