I have two '03s with the HO engine and 48re's. They pull 15k loads on a daily basis. The dually is close to 70k miles and the quad is close to 50k miles. Niether one has needed anything other than scheduled maint. I am very happy with the new auto transmission, so happy I bought one for myself and in the process unloaded an '03 Chev Duramax/Allison. I prefer the function of the 48re to the Allison.