I am not very familiar with the Auto/Ultra shift trannies, but we have a very good Allison mechanic in our area. I think he has done swaps already. We have a 2013 t800 that we bought with an Allison in it. Our older drivers really like it, but it is below the dignity of a Super Trucker to run an auto. I think the Allison is more reliable than the automated manuals out there, at least that is what I am told.