actually, from every survey that i have seen, the allison that sits behind the duramax has the highest incident of repair of the main three light duty diesels. the last survey had ford first, dodge right behind it and the allison (a generic allison i believe) was quite a ways back in third place. so far my 48re has been pretty solid. i got two frineds with fords, one a 6.0 and one a 7.3. both are on their second tranny.