Didn't think to ask if it was tied into the Allison. Could be as simple as re-programing if it is computer controlled. Yeah, I would take it back to them too. If it worked before they got hold of it they really need to fix this issue at no cost.
TV1: Black Sheep, 2001 Dodge 3500, 800,xxx miles, a few non-stock parts here and there...
TV2: Brownie, 1989 Dodge W250, only 256,000 miles!
TV3: 2004.5 Dodge 3500, 415,000 miles, 6 spd
TV4: 2005 Dodge 3500, 478,000 miles, 4spd auto
"Too much of what I once knew I now know not" Me